Ministry of Internal Affairs and Communications monitors the price of eating out at a restaurant monthly.
The data below show the changes in the price indexes of eating udon noodle out at a noodle restaurant between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of a serving of udon noodle (yen) |
| 1970 | 15.2 | 92 |
| 1971 | 17.2 | 104 |
| 1972 | 19.3 | 116 |
| 1973 | 23.0 | 138 |
| 1974 | 31.0 | 187 |
| 1975 | 36.6 | 220 |
| 1976 | 40.6 | 244 |
| 1977 | 44.7 | 269 |
| 1978 | 47.1 | 284 |
| 1979 | 49.1 | 296 |
| 1980 | 54.1 | 326 |
| 1981 | 57.7 | 347 |
| 1982 | 60.4 | 364 |
| 1983 | 62.9 | 379 |
| 1984 | 65.1 | 392 |
| 1985 | 66.7 | 402 |
| 1986 | 67.9 | 409 |
| 1987 | 68.7 | 414 |
| 1988 | 69.6 | 419 |
| 1989 | 73.2 | 441 |
| 1990 | 75.5 | 455 |
| 1991 | 79.6 | 479 |
| 1992 | 82.7 | 498 |
| 1993 | 84.8 | 510 |
| 1994 | 86.4 | 520 |
| 1995 | 87.0 | 524 |
| 1996 | 87.4 | 526 |
| 1997 | 91.1 | 548 |
| 1998 | 93.0 | 560 |
| 1999 | 93.4 | 562 |
| 2000 | 93.7 | 564 |
| 2001 | 93.9 | 565 |
| 2002 | 93.8 | 565 |
| 2003 | 93.8 | 565 |
| 2004 | 94.5 | 569 |
| 2005 | 95.0 | 572 |
| 2006 | 95.3 | 574 |
| 2007 | 95.8 | 577 |
| 2008 | 98.2 | 591 |
| 2009 | 99.7 | 600 |
| 2010 | 100.0 | 602 |
| 2011 | 100.4 | 604 |
| 2012 | 100.6 | 606 |
| 2013 | 100.6 | 606 |
| 2014 | 103.7 | 624 |
The next graph shows the changes in the price of a bowl of udon noodle 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=000011288564
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