Chart 4. Annualized R-CPI-I inflation rate, by index population, 2006–23 (in percent)
Index population Annualized inflation rate

CPI-U

 2.48

R-CPI-I, Q1

 2.66

R-CPI-I, Q2

 2.60

R-CPI-I, Q3

 2.52

R-CPI-I, Q4

 2.46

R-CPI-I, Q5

 2.38

Note: R-CPI-I = Research Consumer Price Index based on a Lowe formula, CPI-U = Consumer Price Index for All Urban Consumers, Q1 = first quintile (lowest 20 percent), Q2 = second quintile (second 20 percent), Q3 = third quintile (third 20 percent), Q4 = fourth quintile (fourth 20 percent), Q5 = fifth quintile (highest 20 percent).

Source: U.S. Bureau of Labor Statistics.