| 年 | データ数 | |
| 2026 | 3 |  |
| 2025 | 8 | |
| 2024 | 4 | |
| 2023 | 11 | |
| 2022 | 9 | |
| 2021 | 16 | |
| 2020 | 13 | |
| 2019 | 12 | |
| 2018 | 12 | |
| 2017 | 37 | |
| 2016 | 34 | |
| 2015 | 35 | |
| 2014 | 51 | |
| 2013 | 56 | |
| 2012 | 75 | |
| 2011 | 89 | |
| 2010 | 126 | |
| 2009 | 142 | |
| 2008 | 258 | |
| 2007 | 374 | |
| 2006 | 410 | |
| 2005 | 434 | |
| 2004 | 394 | |
| 2003 | 346 | |
| 2002 | 353 | |
| 2001 | 306 | |
| 2000 | 313 | |
| 1999 | 322 | |
| 1998 | 288 | |
| 1997 | 277 | |
| 1996 | 282 | |
| 1995 | 247 | |
| 1994 | 276 | |
| 1993 | 238 | |
| 1992 | 198 | |
| 1991 | 183 | |
| 1990 | 161 | |
| 1989 | 160 | |
| 1988 | 117 | |
| 1987 | 107 | |
| 1986 | 86 | |
| 1985 | 80 | |
| 1984 | 71 | |
| 1983 | 57 | |
| 1982 | 51 | |
| 1981 | 45 | |
| 1980 | 52 | |
| 1979 | 39 | |
| 1978 | 29 | |
| 1977 | 33 | |
| 1976 | 20 | |
| 1975 | 11 | |
| 1974 | 8 | |
| 1973 | ||
| 1972 | 2 | |
| 1971 | ||
| 1970 | ||
| 1969 | ||
| 1968 | 4 | |
| 1967 | 2 | |
| 1966 | 4 | |