| 年 | データ数 | |
| 2026 | 4 |  |
| 2025 | 9 | |
| 2024 | 10 | |
| 2023 | 16 | |
| 2022 | 15 | |
| 2021 | 21 | |
| 2020 | 20 | |
| 2019 | 19 | |
| 2018 | 23 | |
| 2017 | 43 | |
| 2016 | 37 | |
| 2015 | 42 | |
| 2014 | 59 | |
| 2013 | 62 | |
| 2012 | 81 | |
| 2011 | 94 | |
| 2010 | 131 | |
| 2009 | 146 | |
| 2008 | 267 | |
| 2007 | 382 | |
| 2006 | 416 | |
| 2005 | 449 | |
| 2004 | 401 | |
| 2003 | 359 | |
| 2002 | 360 | |
| 2001 | 319 | |
| 2000 | 319 | |
| 1999 | 325 | |
| 1998 | 291 | |
| 1997 | 285 | |
| 1996 | 285 | |
| 1995 | 249 | |
| 1994 | 284 | |
| 1993 | 240 | |
| 1992 | 202 | |
| 1991 | 185 | |
| 1990 | 164 | |
| 1989 | 163 | |
| 1988 | 123 | |
| 1987 | 114 | |
| 1986 | 90 | |
| 1985 | 84 | |
| 1984 | 80 | |
| 1983 | 67 | |
| 1982 | 61 | |
| 1981 | 54 | |
| 1980 | 61 | |
| 1979 | 41 | |
| 1978 | 32 | |
| 1977 | 39 | |
| 1976 | 22 | |
| 1975 | 11 | |
| 1974 | 9 | |
| 1973 | 1 | |
| 1972 | 3 | |
| 1971 | 1 | |
| 1970 | 1 | |
| 1969 | ||
| 1968 | 4 | |
| 1967 | 2 | |
| 1966 | 4 | |