Japanese government monitors the price of chewing gum every month.
The following data show the changes in the price indexes of chewing gum between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of 14 pieces chewing gum (yen) |
| 1970 | 30.5 | 37 |
| 1971 | 38.4 | 46 |
| 1972 | 38.2 | 46 |
| 1973 | 37.9 | 45 |
| 1974 | 55 | 66 |
| 1975 | 62 | 74 |
| 1976 | 61.4 | 74 |
| 1977 | 60.9 | 73 |
| 1978 | 60.5 | 73 |
| 1979 | 60.1 | 72 |
| 1980 | 64.9 | 78 |
| 1981 | 74.1 | 89 |
| 1982 | 74.6 | 90 |
| 1983 | 74.7 | 90 |
| 1984 | 74.7 | 90 |
| 1985 | 74.8 | 90 |
| 1986 | 74.7 | 90 |
| 1987 | 74.7 | 90 |
| 1988 | 74.7 | 90 |
| 1989 | 75.7 | 91 |
| 1990 | 79.8 | 96 |
| 1991 | 89.3 | 107 |
| 1992 | 89.9 | 108 |
| 1993 | 94.4 | 113 |
| 1994 | 98.7 | 118 |
| 1995 | 98.4 | 118 |
| 1996 | 98.3 | 118 |
| 1997 | 99.6 | 120 |
| 1998 | 100.1 | 120 |
| 1999 | 100.1 | 120 |
| 2000 | 100 | 120 |
| 2001 | 99.7 | 120 |
| 2002 | 99.7 | 120 |
| 2003 | 99.6 | 120 |
| 2004 | 100.1 | 120 |
| 2005 | 100.4 | 120 |
| 2006 | 100.1 | 120 |
| 2007 | 100.5 | 121 |
| 2008 | 100.9 | 121 |
| 2009 | 100.6 | 121 |
| 2010 | 100 | 120 |
| 2011 | 99.8 | 120 |
| 2012 | 99.4 | 119 |
| 2013 | 99.1 | 119 |
| 2014 | 101.6 | 122 |
The next data show the changes in 14 pieces chewing gum 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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