ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt
 
The site above contains the data I show here.
 
The average CPI in 1984 was 103.9. In 1994, it was 148.2. Since 148.2/103.9 = 1.426, the CPI increased 42.6%. 
The average CPI in 2004 was 188.9. Since 188.9/148.2 = 1.2746, the CPI increased 27.46%.
 
4-20-2005 U.S. Department Of Labor Page 1 
  Bureau of Labor Statistics
 Washington, D.C. 20212
 
 Consumer Price Index
 
  All Urban Consumers - (CPI-U)
 
 U.S. city average
 
 All items
 
 1982-84=100
 
 SEMIANNUAL
 PERCENT CHANGE
  1ST 2ND
 YEAR JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEP. OCT. NOV. DEC. HALF HALF AVG. DEC-DEC AVG-AVG
 1984 101.9 102.4 102.6 103.1 103.4 103.7 104.1 104.5 105.0 105.3 105.3 105.3 102.9 104.9 103.9 3.9 4.3
 1985 105.5 106.0 106.4 106.9 107.3 107.6 107.8 108.0 108.3 108.7 109.0 109.3 106.6 108.5 107.6 3.8 3.6
 1986 109.6 109.3 108.8 108.6 108.9 109.5 109.5 109.7 110.2 110.3 110.4 110.5 109.1 110.1 109.6 1.1 1.9
 1987 111.2 111.6 112.1 112.7 113.1 113.5 113.8 114.4 115.0 115.3 115.4 115.4 112.4 114.9 113.6 4.4 3.6
 1988 115.7 116.0 116.5 117.1 117.5 118.0 118.5 119.0 119.8 120.2 120.3 120.5 116.8 119.7 118.3 4.4 4.1
 1989 121.1 121.6 122.3 123.1 123.8 124.1 124.4 124.6 125.0 125.6 125.9 126.1 122.7 125.3 124.0 4.6 4.8
 1990 127.4 128.0 128.7 128.9 129.2 129.9 130.4 131.6 132.7 133.5 133.8 133.8 128.7 132.6 130.7 6.1 5.4
 
 1991 134.6 134.8 135.0 135.2 135.6 136.0 136.2 136.6 137.2 137.4 137.8 137.9 135.2 137.2 136.2 3.1 4.2
 1992 138.1 138.6 139.3 139.5 139.7 140.2 140.5 140.9 141.3 141.8 142.0 141.9 139.2 141.4 140.3 2.9 3.0
 1993 142.6 143.1 143.6 144.0 144.2 144.4 144.4 144.8 145.1 145.7 145.8 145.8 143.7 145.3 144.5 2.7 3.0
 1994 146.2 146.7 147.2 147.4 147.5 148.0 148.4 149.0 149.4 149.5 149.7 149.7 147.2 149.3 148.2 2.7 2.6
 1995 150.3 150.9 151.4 151.9 152.2 152.5 152.5 152.9 153.2 153.7 153.6 153.5 151.5 153.2 152.4 2.5 2.8
 
 1996 154.4 154.9 155.7 156.3 156.6 156.7 157.0 157.3 157.8 158.3 158.6 158.6 155.8 157.9 156.9 3.3 3.0
 1997 159.1 159.6 160.0 160.2 160.1 160.3 160.5 160.8 161.2 161.6 161.5 161.3 159.9 161.2 160.5 1.7 2.3
 1998 161.6 161.9 162.2 162.5 162.8 163.0 163.2 163.4 163.6 164.0 164.0 163.9 162.3 163.7 163.0 1.6 1.6
 1999 164.3 164.5 165.0 166.2 166.2 166.2 166.7 167.1 167.9 168.2 168.3 168.3 165.4 167.8 166.6 2.7 2.2 
 2000 168.8 169.8 171.2 171.3 171.5 172.4 172.8 172.8 173.7 174.0 174.1 174.0 170.8 173.6 172.2 3.4 3.4
 
 2001 175.1 175.8 176.2 176.9 177.7 178.0 177.5 177.5 178.3 177.7 177.4 176.7 176.6 177.5 177.1 1.6 2.8
 2002 177.1 177.8 178.8 179.8 179.8 179.9 180.1 180.7 181.0 181.3 181.3 180.9 178.9 180.9 179.9 2.4 1.6 
 2003 181.7 183.1 184.2 183.8 183.5 183.7 183.9 184.6 185.2 185.0 184.5 184.3 183.3 184.6 184.0 1.9 2.3 
 2004 185.2 186.2 187.4  188.0 189.1 189.7 189.4 189.5 189.9 190.9 191.0 190.3 187.6 190.2 188.9 3.3 2.7