The cost-of-living has increased 6.98% for 2005 - 2007. Other data for different time periods and measurements are listed in the following links from the Bureau of Labor Statistics:
http://www.bls.gov/cpi/cpifaq.htm#Question_1
http://www.bls.gov/news.release/pdf/cpi.pdf
http://www.bls.gov/cpi/cpid0710.pdf
ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt
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