Over the past two decades, U. S. medical prices — not total spending — have been rising at around 5% per year, or twice the increase in the CPI.

过去二十年间，美国的医疗价格——并不是总花费——每年的涨幅约为5%，也就是“居民消费价格指数”(CPI)的两倍。

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Back in September 2010, the CPI-U stood at 218.439, and it grew to 223.467 in March 2011.

FORBES: How To Predict Savings Bond Rates

The CPI-U increased from 218.439 in September 2010 to 223.467 in March 2011, a six-month increase of 2.30%.

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For the May 2011 rate update, you needed the March 2011 CPI-U numbers (released in mid-April) as well as the September 2010 CPI-U numbers.

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