Japanese government monitors the price of banana every month.
The following data show the changes in the price indexes of banana between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of 1kg bananas (yen) |
| 1970 | 71.1 | 162 |
| 1971 | 59.2 | 135 |
| 1972 | 50.9 | 116 |
| 1973 | 52.4 | 119 |
| 1974 | 67.8 | 155 |
| 1975 | 71.6 | 163 |
| 1976 | 76.9 | 175 |
| 1977 | 77.2 | 176 |
| 1978 | 72.5 | 165 |
| 1979 | 75.2 | 171 |
| 1980 | 83.9 | 191 |
| 1981 | 92 | 210 |
| 1982 | 87.1 | 199 |
| 1983 | 106.6 | 243 |
| 1984 | 95.7 | 218 |
| 1985 | 108.3 | 247 |
| 1986 | 94.5 | 215 |
| 1987 | 84.8 | 193 |
| 1988 | 87.5 | 200 |
| 1989 | 92 | 210 |
| 1990 | 95.4 | 218 |
| 1991 | 101.8 | 232 |
| 1992 | 104.1 | 237 |
| 1993 | 84.5 | 193 |
| 1994 | 78.3 | 179 |
| 1995 | 77.1 | 176 |
| 1996 | 83.5 | 190 |
| 1997 | 88.8 | 202 |
| 1998 | 98.2 | 224 |
| 1999 | 96.7 | 220 |
| 2000 | 87.4 | 199 |
| 2001 | 84.1 | 192 |
| 2002 | 96.6 | 220 |
| 2003 | 93.7 | 214 |
| 2004 | 94.2 | 215 |
| 2005 | 91.5 | 209 |
| 2006 | 90.5 | 206 |
| 2007 | 99.5 | 227 |
| 2008 | 103.8 | 237 |
| 2009 | 104.3 | 238 |
| 2010 | 100 | 228 |
| 2011 | 97.4 | 222 |
| 2012 | 92.8 | 212 |
| 2013 | 93.9 | 214 |
| 2014 | 97.2 | 222 |
The next data show the changes in 1kg bananas 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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