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 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
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
Pearl Harbor: Japanese losses December 7, 1941
Japanese military losses during the attack on Pearl Harbor on December 7, 1941
WWII: days taken for successful Axis invasions 1939-1941
Number of days taken for the successful Axis invasion of selected countries or territories during the Second World War from 1939 to 1941
WWII: Japanese military wages by rank 1944
Basic monthly wage rates in the Japanese Army during the Second World War in 1944 (in Japanese yen)
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
Current year in various historical and world calendars 2024
Current year according to various historical and world calendars, as of January 1. 2024
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 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
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 naval force December 7, 1941
Number of Japanese naval forces mobilized for the attack on Pearl Harbor on December 7, 1941
Hungarians' concerns about the Russia-Ukraine war resulting in World War III 2022
How much do you agree with the statement that we are facing World War III?
U.S. Data center inventory 2021-2023, by primary market
Total inventory in primary data center markets in the United States in second half 2021 and second half 2023 (in megawatts)
U.S. Data center inventory growth 2020-2023, by primary market
Total inventory growth among primary data center markets in the United States from 2020 to second half 2023
Population of the world 10,000BCE-2100
Estimated global population from 10,000BCE to 2100 (in millions)
Opinion on reparations from Germany for losses caused by WW2 in Poland 2017-2023
Share of people who believe that Poland should demand reparations from Germany for losses caused by World War II from 2017 to 2023
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
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)
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)
WWII: height of nuclear bomb drops and detonations 1945
Estimated height at which the nuclear bombs were dropped and detonated over Hiroshima and Nagasaki in 1945 (in feet)
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
EU share of world exports and imports 2002-2023
Annual share of world goods imports and exports of the European Union from 2002 to 2023
World population by age and region 2023
Proportion of selected age groups of world population and in regions in 2023
Number of HIV-infected people by world region 2022
Number of people living with HIV by world region in 2022 (in millions)
New HIV infections by world region 2022
Number of new HIV infections in 2022, by world region (in 1,000s)*
United States: Senate vote results when declaring war 1812-1942
Results of votes to declare war in the United States Senate from 1812 to 1942
Value of MSCI World USD index 1986-2023
Development of the MSCI World USD index from 1986 to 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
United States: House vote results to declare war 1812-1942
Results of votes to declare war in the United States House of Representatives from 1812 to 1942
Vietnam War: U.S. military personnel by branch of service 1964-1975
Total number of United States military personnel serving during the Vietnam War by branch of service from 1964 to 1975 (in 1,000s)
Civilian deaths in Iraq war 2003-2024
Number of documented civilian deaths in the Iraq war from 2003 to 2024
Leading container ship operators - share of world liner fleet 2024
Leading ship operator's share of the world liner fleet as of April 16, 2024
IT data center systems total spending worldwide 2012-2024
Information technology (IT) spending on data center systems worldwide from 2012 to 2024 (in billion U.S. dollars)
Data center market size in Japan 2023-2028
Value of the data center market in Japan in 2023 with a forecast for 2028 (in trillion Japanese yen)
Number of Palestinian & Israeli casualties caused by the Hamas-Israel war 2023
Number of Palestinian¹ and Israeli² fatalities and injuries caused by war between Hamas and Israel in since October 7, 2023
Data center market size in Japan 2023, by segment
Value of the data center market in Japan in 2023, by segment (in billion Japanese yen)
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