Ministry of Internal Affairs and Communications monitors the price of taros monthly.
The data below show the changes in the price indexes of taros between 1970 and 2014, if the price in 2010 is taken as 100. The price is in a long-term rising trend.
| Year | Index (2010 = 100) | Price of 1kg taros (yen) |
| 1970 | 25.6 | 141 |
| 1971 | 27.2 | 150 |
| 1972 | 23.5 | 129 |
| 1973 | 39.9 | 219 |
| 1974 | 60.2 | 331 |
| 1975 | 52 | 286 |
| 1976 | 47.6 | 262 |
| 1977 | 44.7 | 246 |
| 1978 | 65.6 | 361 |
| 1979 | 66.9 | 368 |
| 1980 | 43.1 | 237 |
| 1981 | 69.7 | 383 |
| 1982 | 79.2 | 436 |
| 1983 | 64.3 | 354 |
| 1984 | 72.8 | 400 |
| 1985 | 74.2 | 408 |
| 1986 | 67.4 | 371 |
| 1987 | 66.8 | 367 |
| 1988 | 64.8 | 356 |
| 1989 | 72.8 | 400 |
| 1990 | 100.8 | 554 |
| 1991 | 105 | 578 |
| 1992 | 86 | 473 |
| 1993 | 112.6 | 619 |
| 1994 | 103.2 | 568 |
| 1995 | 105.6 | 581 |
| 1996 | 104.8 | 576 |
| 1997 | 90.7 | 499 |
| 1998 | 82.9 | 456 |
| 1999 | 83 | 457 |
| 2000 | 85.4 | 470 |
| 2001 | 84.6 | 465 |
| 2002 | 88.3 | 486 |
| 2003 | 87 | 479 |
| 2004 | 82.1 | 452 |
| 2005 | 81.8 | 450 |
| 2006 | 101.3 | 557 |
| 2007 | 106.9 | 588 |
| 2008 | 110.7 | 609 |
| 2009 | 95.2 | 524 |
| 2010 | 100 | 550 |
| 2011 | 109.6 | 603 |
| 2012 | 100 | 550 |
| 2013 | 105.6 | 581 |
| 2014 | 128.4 | 706 |
The next graph shows the changes in 1 kg taros 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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