what year was inflation the highest
Since the founding of the United States in 1776 the highest year-over-year inflation rate observed was 29.78% in 1778. Inflation is calculated using the yearly change in the consumer price index (CPI), which was first introduced in 1913. CPI data before 1913 is estimated using a variety of methods and sources. Since the introduction of the CPI, the highest inflation rate observed was 19.66% in 1917. Year-over-year inflation is calculated by subtracting the value of the CPI at the beginning of the year, and subtracting the value at the end of year.
Lowest inflation may refer to years with the greatest deflation or the lowest amount of inflation above or equal to 0%. There were several years before the introduction of the consumer price index (CPI) in 1913 when inflation estimates were reported as 0% largely due to a lack of available data. The highest year-over-year deflation rate before 1913 was in 1780 when it was estimated at 19.34%. The lowest inflation rate above 0% before 1913 was in 1827 when it was estimated to have been 0.83%. As of 2014, the highest deflation rate in 1913 and after was 10.68% in 1921. The lowest inflation rate in 1913 and after was 0% in 1929. Year-over-year inflation is calculated by subtracting the value of the CPI at the end of the year from the value of the CPI at the beginning of the year.