The changes measured by the Consumers Price Index are usually expressed as percentages. Next subtract the old value from the new value. To calculate percent change start by determining both the old and new values for the amount that has changed.
This means that inflation grew by how much over the decade.
The base year by definition has an index value equal to 100. The GDP deflator is a measure of the price level of all domestically produced final goods and services in an economy. Among the many other price indices the consumer price index CPI is the most frequently cited. To work out the increase as a percentage it is now necessary to divide the increase by the original January number.