Ministry of Internal Affairs and Communications monitors the price of butter monthly.
The data below show the changes in the price indexes of butter between 1970 and 2014, if the price in 2010 is taken as 100. Recently the price is rising rapidly.
| Year | Index (2010 = 100) | Price of 200g butter (yen) |
| 1970 | 41.7 | 158 |
| 1971 | 44.1 | 168 |
| 1972 | 46.2 | 176 |
| 1973 | 48 | 182 |
| 1974 | 54.7 | 208 |
| 1975 | 68.3 | 260 |
| 1976 | 73.9 | 281 |
| 1977 | 76.3 | 290 |
| 1978 | 81.5 | 310 |
| 1979 | 81.6 | 310 |
| 1980 | 81.9 | 311 |
| 1981 | 82.2 | 312 |
| 1982 | 84 | 319 |
| 1983 | 89.8 | 341 |
| 1984 | 90 | 342 |
| 1985 | 90 | 342 |
| 1986 | 90 | 342 |
| 1987 | 87.7 | 333 |
| 1988 | 86.3 | 328 |
| 1989 | 88.3 | 336 |
| 1990 | 88.5 | 336 |
| 1991 | 88.5 | 336 |
| 1992 | 88.5 | 336 |
| 1993 | 88.2 | 335 |
| 1994 | 87.3 | 332 |
| 1995 | 86.8 | 330 |
| 1996 | 86.6 | 329 |
| 1997 | 88.1 | 335 |
| 1998 | 87.9 | 334 |
| 1999 | 87.6 | 333 |
| 2000 | 86.9 | 330 |
| 2001 | 84.8 | 322 |
| 2002 | 84.9 | 323 |
| 2003 | 83.9 | 319 |
| 2004 | 84.8 | 322 |
| 2005 | 84.7 | 322 |
| 2006 | 84.6 | 321 |
| 2007 | 84.9 | 323 |
| 2008 | 95 | 361 |
| 2009 | 100.4 | 382 |
| 2010 | 100 | 380 |
| 2011 | 101 | 384 |
| 2012 | 103.8 | 394 |
| 2013 | 105 | 399 |
| 2014 | 109.7 | 417 |
The next graph shows the changes in 200g butter price from 1970 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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