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This statistic shows the monthly percentage of change in the consumer price index for urban consumers in the United States from April 2011 to April 2012. The data represents city averages in the United States. The defined base period is: 1982-84=100. The CPI is defined by the United States Bureau of Labor Statistics as "a measure of the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services". In April 2012, the CPI-U, seasonally adjusted, remained unchanged from March 2012.