1. Bureau of Labor Statistics, Consumer Price Index, U.S. City Average of Annual Inflation (April to April), 2008 (Washington: BLS, 2008); and
2. BLS, Seasonally Adjusted Data from the Current Employment Statistics Survey (April to April), 2008 (Washington: BLS, 2008). The use of the April-to-April time period is consistent with our previous practice. We note, however, that the May-to-May inflation estimate is higher (4.2 percent). Because the estimate for the percentage increase in premiums comes from a survey, it has a 95 percent confidence interval wide enough to overlap the changes both for earnings and for inflation, which are estimated with much greater accuracy. The premium change does not differ significantly from either of those measures.