Ministry of Internal Affairs and Communications has checked the price of yogurt for 30 years. The following data show the trend of the price indexes of yogurt between 1985 and 2014, if the price in 2010 is taken as 100. The price is decreasing gradually.
| Year | Index (2010 = 100) | Price of 1kg yogurt (yen) |
| 1985 | 125.3 | 476 |
| 1986 | 124.1 | 472 |
| 1987 | 123 | 467 |
| 1988 | 121 | 460 |
| 1989 | 121.5 | 462 |
| 1990 | 124.1 | 472 |
| 1991 | 125.3 | 476 |
| 1992 | 123.8 | 470 |
| 1993 | 122.2 | 464 |
| 1994 | 121 | 460 |
| 1995 | 117.1 | 445 |
| 1996 | 114.1 | 434 |
| 1997 | 114 | 433 |
| 1998 | 113.1 | 430 |
| 1999 | 112.3 | 427 |
| 2000 | 109.8 | 417 |
| 2001 | 107.8 | 410 |
| 2002 | 106.7 | 405 |
| 2003 | 105.7 | 402 |
| 2004 | 104.5 | 397 |
| 2005 | 102.7 | 390 |
| 2006 | 100.7 | 383 |
| 2007 | 98.5 | 374 |
| 2008 | 100.1 | 380 |
| 2009 | 101.3 | 385 |
| 2010 | 100 | 380 |
| 2011 | 99 | 376 |
| 2012 | 95.8 | 364 |
| 2013 | 93.6 | 356 |
| 2014 | 94.9 | 361 |
The next graph shows the changes in 1kg yogurt price from 1985 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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