Oyako-don is Japanese rice bowl dish, in which chicken, egg, sliced onions, and other ingredients are all simmered together and then served on top of a large bowl of rice.
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 Oyako-don out at a restaurant between 1970 and 2014, if the price in 2010 is taken as 100.
| Year | Index (2010 = 100) | Price of one bowl of oyako-don (yen) |
| 1970 | 24.2 | 204 |
| 1971 | 26.4 | 223 |
| 1972 | 28.4 | 240 |
| 1973 | 32.4 | 273 |
| 1974 | 40.9 | 345 |
| 1975 | 47.2 | 398 |
| 1976 | 51.8 | 437 |
| 1977 | 55.8 | 471 |
| 1978 | 58.4 | 493 |
| 1979 | 60.1 | 507 |
| 1980 | 64.8 | 547 |
| 1981 | 68.0 | 574 |
| 1982 | 70.2 | 592 |
| 1983 | 72.0 | 608 |
| 1984 | 73.6 | 621 |
| 1985 | 75.1 | 634 |
| 1986 | 76.2 | 643 |
| 1987 | 76.9 | 649 |
| 1988 | 77.5 | 654 |
| 1989 | 80.4 | 679 |
| 1990 | 82.1 | 693 |
| 1991 | 84.7 | 715 |
| 1992 | 87.1 | 735 |
| 1993 | 88.8 | 749 |
| 1994 | 90.6 | 765 |
| 1995 | 91.2 | 770 |
| 1996 | 91.6 | 773 |
| 1997 | 94.2 | 795 |
| 1998 | 95.7 | 808 |
| 1999 | 96.0 | 810 |
| 2000 | 96.2 | 812 |
| 2001 | 96.3 | 813 |
| 2002 | 96.2 | 812 |
| 2003 | 96.2 | 812 |
| 2004 | 96.7 | 816 |
| 2005 | 96.9 | 818 |
| 2006 | 96.9 | 818 |
| 2007 | 97.1 | 820 |
| 2008 | 98.6 | 832 |
| 2009 | 99.8 | 842 |
| 2010 | 100.0 | 844 |
| 2011 | 100.1 | 845 |
| 2012 | 100.1 | 845 |
| 2013 | 100.3 | 847 |
| 2014 | 103.1 | 870 |
The next graph shows the changes in the price of one bowl of Oyako-don 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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