Ministry of Internal Affairs and Communications monitors the price of grapefruit monthly.
The data below show the changes in the price indexes of grapefruit between 1975 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of 1kg grapefruit (yen) |
| 1975 | 84.2 | 242 |
| 1976 | 89.4 | 257 |
| 1977 | 89.2 | 256 |
| 1978 | 96 | 276 |
| 1979 | 95.6 | 274 |
| 1980 | 109.9 | 315 |
| 1981 | 120.3 | 345 |
| 1982 | 125.8 | 361 |
| 1983 | 120.7 | 346 |
| 1984 | 113.8 | 327 |
| 1985 | 129.3 | 371 |
| 1986 | 116 | 333 |
| 1987 | 109.4 | 314 |
| 1988 | 105.8 | 304 |
| 1989 | 109.7 | 315 |
| 1990 | 128.5 | 369 |
| 1991 | 127.9 | 367 |
| 1992 | 127.1 | 365 |
| 1993 | 121.1 | 348 |
| 1994 | 109.5 | 314 |
| 1995 | 106.4 | 305 |
| 1996 | 107.6 | 309 |
| 1997 | 113.9 | 327 |
| 1998 | 116.2 | 333 |
| 1999 | 118.9 | 341 |
| 2000 | 109.7 | 315 |
| 2001 | 112.7 | 323 |
| 2002 | 112.1 | 322 |
| 2003 | 113.5 | 326 |
| 2004 | 105.9 | 304 |
| 2005 | 126.7 | 364 |
| 2006 | 129.4 | 371 |
| 2007 | 117.1 | 336 |
| 2008 | 114.3 | 328 |
| 2009 | 105.3 | 302 |
| 2010 | 100 | 287 |
| 2011 | 99.8 | 286 |
| 2012 | 100 | 287 |
| 2013 | 105.4 | 302 |
| 2014 | 120.7 | 346 |
The next graph shows the changes in 1 kg grapefruits 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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