Japanese government monitors the price of mayonnaise every month.
The following data show the changes in the price indexes of mayonnaise between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of 450g mayonnaise (yen) |
| 1970 | 56.3 | 141 |
| 1971 | 58.4 | 146 |
| 1972 | 58.5 | 146 |
| 1973 | 61.6 | 154 |
| 1974 | 87.6 | 219 |
| 1975 | 108.2 | 271 |
| 1976 | 105.1 | 263 |
| 1977 | 102.5 | 256 |
| 1978 | 100.5 | 251 |
| 1979 | 100.1 | 250 |
| 1980 | 100.3 | 251 |
| 1981 | 101.1 | 253 |
| 1982 | 112.3 | 281 |
| 1983 | 113.5 | 284 |
| 1984 | 113.9 | 285 |
| 1985 | 117.3 | 293 |
| 1986 | 118.8 | 297 |
| 1987 | 111.8 | 280 |
| 1988 | 107.4 | 269 |
| 1989 | 109.2 | 273 |
| 1990 | 114.7 | 287 |
| 1991 | 121.1 | 303 |
| 1992 | 121.3 | 303 |
| 1993 | 121.2 | 303 |
| 1994 | 118.9 | 297 |
| 1995 | 114.1 | 285 |
| 1996 | 109.1 | 273 |
| 1997 | 109.3 | 273 |
| 1998 | 108.5 | 271 |
| 1999 | 106.8 | 267 |
| 2000 | 105.6 | 264 |
| 2001 | 102.8 | 257 |
| 2002 | 100.7 | 252 |
| 2003 | 98.5 | 246 |
| 2004 | 97.1 | 243 |
| 2005 | 96.9 | 242 |
| 2006 | 92.8 | 232 |
| 2007 | 98.5 | 246 |
| 2008 | 107.8 | 270 |
| 2009 | 105.6 | 264 |
| 2010 | 100.0 | 250 |
| 2011 | 98.1 | 245 |
| 2012 | 96.8 | 242 |
| 2013 | 100.1 | 250 |
| 2014 | 109.1 | 273 |
The next data show the changes in 1kg mayonnaise 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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