Aaron O'Neill
Research expert covering historical data
Detailed statistics
Pearl Harbor: U.S. casualties and fatalities
Detailed statistics
WWII: military spending as a share of national income 1939-1944
Detailed statistics
United States: House vote results to declare war 1812-1942
Pearl Harbor: Japanese losses December 7, 1941
Japanese military losses during the attack on Pearl Harbor on December 7, 1941
Tonnage of bombs dropped in attacks on Dresden during WWII 1944-1945
Tonnage of bombs dropped in attacks on Dresden during the Second World War in 1944 and 1945
Number of aircraft involved in attacks on Dresden during WWII 1944-1945
Total number of aircraft used in aerial attacks on Dresden during the Second World War in 1944 and 1945
Number of visitors to the World War II Memorial in the U.S. 2008-2023
Number of recreational visitors to the World War II Memorial in the United States from 2008 to 2023 (in millions)
Second World War: fatalities per country 1939-1945
Estimated number of military and civilian fatalities due to the Second World War per country or region between 1939 and 1945
Number of casualties in major battles in the American Civil War 1861-1865
Number of casualties in major battles in the American Civil War from 1861 to 1865
Current year in various historical and world calendars 2024
Current year according to various historical and world calendars, as of January 1. 2024
American Civil War: population of the Union states 1860-1870
Population of the Union States before and after the American Civil War in 1860 and 1870 (in 1,000s)
Population of the Confederate States in the American Civil War 1860-1870
Population of the Confederate States before and after the American Civil War in 1860 and 1870 (in 1,000s)
Annual oil production by world region 1965-2022
Annual oil production by world region from 1965 to 2022 (in equivalent Terawatt hours)
Territory held by Germany and its allies in mid-1941 during the Second World War
Area of land controlled by Germany and its European allies during the Second World War in mid-1941 (in thousand square kilometers)
Number of casualties at the Siege of Vicksburg 1863
Number of casualties at the Siege of Vicksburg in the American Civil War in 1863
Number of independent countries in Europe each year 1900-2022
Total number of independent states in Europe at the end of each year from 1900 to 2022
Number of casualties at the Battle of Gettysburg 1863
Number of casualties at the Battle of Gettysburg in the American Civil War in 1863
Number of casualties at the Battle of Chancellorsville 1863
Number of casualties at the Battle of Chancellorsville in the American Civil War in 1863
Number of casualties at the Battle of Shiloh 1862
Number of casualties at the Battle of Shiloh in the American Civil War in 1862
Number of casualties at the Battle of Chickamauga 1863
Number of casualties at the Battle of Chickamauga in the American Civil War in 1863
Number of casualties at the Battle of Antietam 1862
Number of casualties at the Battle of Antietam in the American Civil War in 1862
Pearl Harbor: U.S. casualties and fatalities
Number of Americans killed or wounded during the Pearl Harbor attack on December 7, 1941
Pearl Harbor: Japanese aerial force December 7, 1941
Number of Japanese aircraft mobilized for the attack on Pearl Harbor on December 7, 1941
Pearl Harbor: U.S. naval losses December 7, 1941
Number of American naval ships destroyed or damaged during the Pearl Harbor attack on December 7, 1941
Number of HIV-infected people by world region 2023
Number of people living with HIV by world region in 2023 (in millions)
Pearl Harbor: U.S. aircraft losses December 7, 1941
Number of American aircraft destroyed or damaged during the Pearl Harbor attack on December 7, 1941
New HIV infections by world region 2023
Number of new HIV infections in 2023, by world region* (in 1,000s)
Pearl Harbor: Japanese naval force December 7, 1941
Number of Japanese naval forces mobilized for the attack on Pearl Harbor on December 7, 1941
U.S. Data center inventory 2021-2024, by primary market
Total inventory in primary data center markets in the United States in second half 2021 and first half 2024 (in megawatts)
Gender ratios in select Allied countries after the Second World War 1950, by age
Number of men per 100 women in select Allied countries following the Second World War in 1950, by age group
Gender ratios in select countries after the Second World War 1950
Number of men per 100 women after the Second World War in select countries in 1950
Occupied territory and population shares of the USSR during the Second World War
Share of the Soviet Union's population and territory occupied by foreign forces during the Second World War between June 1941 and August 1944
Mortality rates in urban Russia during the Second World War 1941, by age and gender
Distribution of deaths per gender and age group in eastern, urban Russia during the Second World War in 1941 (per 1,000 deaths)
Cement output and metal-working tools by major powers during Second World War 1940
Cement output and number of machine tools for working metal by major powers during the Second World War in 1940
Gender ratios in select Axis countries after the Second World War 1950, by age
Number of men per 100 women in select Axis countries following the Second World War in 1950, by age group
Average change in internet traffic in Israeli cities following Israel-Hamas war 2023
Average change in internet data usage in Israel following the outbreak of Israel-Hamas war from September to November 2023, by city
Mortality rates in urban areas of Russia during the Second World War 1941-1944 by age
Distribution of deaths per age group in unoccupied, urban areas of Soviet Russia during the Second World War from 1941 to 1944 (per 1,000 deaths)
Mortality rates in rural Russia during the Second World War 1941-1944, by age
Distribution of deaths per age group in rural Russia during the Second World War from 1941 to 1944 (in percent)
Coal and petroleum output by major power during the Second World War 1940
Output of coal and crude petroleum by major powers during the Second World War in 1940 (in millions of tons)
Electricity output by major power during the Second World War 1940
Electricity output by major powers during the Second World War in 1940 (in billions of kilowatt hours)
Manhattan Project: cumulative costs by facility 1945
Cumulative costs of the Manhattan Project until December 31, 1945, by facility (in 1,000s of U.S. dollars)
WWII: Hiroshima and Nagasaki casualties 1945
Estimated total populations, fatalities, and injuries during the atomic bombings of Hiroshima and Nagasaki from August 6-9, 1945
WWII: Nagasaki casualties by distance from ground zero 1945
Estimated number of casualties following the atomic bombing of Nagasaki on August 9, 1945 by distance from ground zero
Manhattan Project: monthly expenditure 1942-1946
Monthly expenditure of the Manhattan Project from August 1942 to December 1946 (in 1,000s of U.S. dollars)
Number of military and civilian deaths per country in the First World War 1914-1918
Number of military and civilian fatalities during the First World War, per country or world power, between 1914 and 1918
Estimates of Danish fatalities during the Second World War 1940-1950
Estimates of Danish fatalities during the Second World War from 1940 to 1950, by affiliation
World population by age and region 2023
Proportion of selected age groups of world population and in regions in 2023
WWII: share of total population lost per country 1939-1945
Total Second World War fatalities as a share of pre-war populations per country or region between 1939 and 1945
Wireless data traffic in Canada Q1 2014-Q2 2023
Wireless data traffic in Canada from 1st quarter 2014 to second quarter 2023 (in million gigabytes)
Civilian deaths in Iraq war 2003-2024
Number of documented civilian deaths in the Iraq war from 2003 to 2024
Average total cost per data breach worldwide 2020-2024, by industry
Average cost of a data breach worldwide from May 2020 to February 2024, by industry (in million U.S. dollars)
Average total cost per data breach worldwide 2024, by country or region
Average cost of a data breach worldwide from March 2023 to February 2024, by country or region (in million U.S. dollars)
Number of Palestinian & Israeli casualties caused by the Hamas-Israel war 2023
Number of Palestinian¹ and Israeli² fatalities and injuries caused by the war between Hamas and Israel since October 7, 2023
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