Napa Cabbages are common vegetables in Eastern Asia. We eat boiled napa cabbages or pickled napa cabbages.
Japanese government monitors the price of napa cabbage every month. The following data show the changes in the price indexes of napa cabbage between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of 1kg napa cabbage (yen) |
| 1970 | 25.6 | 50 |
| 1971 | 26 | 51 |
| 1972 | 19.5 | 38 |
| 1973 | 27.2 | 53 |
| 1974 | 37.8 | 74 |
| 1975 | 36.8 | 72 |
| 1976 | 42.8 | 83 |
| 1977 | 37.1 | 72 |
| 1978 | 37.2 | 73 |
| 1979 | 51.4 | 100 |
| 1980 | 83.4 | 163 |
| 1981 | 53 | 103 |
| 1982 | 52.6 | 103 |
| 1983 | 61.8 | 121 |
| 1984 | 60.4 | 118 |
| 1985 | 56.3 | 110 |
| 1986 | 62 | 121 |
| 1987 | 58.1 | 113 |
| 1988 | 86 | 168 |
| 1989 | 72.9 | 142 |
| 1990 | 90.6 | 177 |
| 1991 | 122.3 | 238 |
| 1992 | 76.6 | 149 |
| 1993 | 92 | 179 |
| 1994 | 104.8 | 204 |
| 1995 | 100.7 | 196 |
| 1996 | 80.9 | 158 |
| 1997 | 86 | 168 |
| 1998 | 131.1 | 256 |
| 1999 | 99 | 193 |
| 2000 | 75 | 146 |
| 2001 | 89.6 | 175 |
| 2002 | 80.2 | 156 |
| 2003 | 82.8 | 161 |
| 2004 | 108.4 | 211 |
| 2005 | 83.8 | 163 |
| 2006 | 86.4 | 168 |
| 2007 | 80.2 | 156 |
| 2008 | 88.4 | 172 |
| 2009 | 84.5 | 165 |
| 2010 | 100 | 195 |
| 2011 | 99.2 | 193 |
| 2012 | 90.5 | 176 |
| 2013 | 102.3 | 199 |
| 2014 | 97.9 | 191 |
The next data show the changes in 1 kg napa cabbage 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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