Ministry of Internal Affairs and Communications has recorded the prices of pork bacon since 1975. The following figure shows the changes in the price indexes of bacon from 1975 to 2014, if the price in 2010 is taken as 100. The price has risen gradually for four decades.
| Year | Index (2010 = 100) | Price of 100g bacon (yen) |
| 1975 | 61.9 | 142 |
| 1976 | 71 | 163 |
| 1977 | 70.2 | 161 |
| 1978 | 70.2 | 161 |
| 1979 | 69.2 | 158 |
| 1980 | 69.9 | 160 |
| 1981 | 72.5 | 166 |
| 1982 | 75.3 | 172 |
| 1983 | 77.3 | 177 |
| 1984 | 77.7 | 178 |
| 1985 | 77.3 | 177 |
| 1986 | 76.5 | 175 |
| 1987 | 75.4 | 173 |
| 1988 | 74.1 | 170 |
| 1989 | 74.3 | 170 |
| 1990 | 76.4 | 175 |
| 1991 | 78.7 | 180 |
| 1992 | 78.9 | 181 |
| 1993 | 78.8 | 180 |
| 1994 | 79.2 | 181 |
| 1995 | 77.7 | 178 |
| 1996 | 77.6 | 178 |
| 1997 | 81.5 | 187 |
| 1998 | 83.3 | 191 |
| 1999 | 84.3 | 193 |
| 2000 | 84.3 | 193 |
| 2001 | 86.3 | 198 |
| 2002 | 88.6 | 203 |
| 2003 | 88.7 | 203 |
| 2004 | 88.8 | 203 |
| 2005 | 91.5 | 210 |
| 2006 | 93.9 | 215 |
| 2007 | 96.8 | 222 |
| 2008 | 101.7 | 233 |
| 2009 | 101.5 | 232 |
| 2010 | 100 | 229 |
| 2011 | 99.4 | 228 |
| 2012 | 97.5 | 223 |
| 2013 | 97 | 222 |
| 2014 | 101.3 | 232 |
The next graph shows the changes in 100g bacon price from 1975 to 2014.
Source is Statistics Bureau. 消費者物価指数 (CPI) 結果
www.stat.go.jp/data/cpi/historic.htm
www.e-stat.go.jp/SG1/estat/Csvdl.do?sinfid=000011288549
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