| 年 | データ数 | |
| 2026 | 2 |  |
| 2025 | 2 | |
| 2024 | 2 | |
| 2023 | 5 | |
| 2022 | 4 | |
| 2021 | 11 | |
| 2020 | 10 | |
| 2019 | 11 | |
| 2018 | 7 | |
| 2017 | 27 | |
| 2016 | 29 | |
| 2015 | 29 | |
| 2014 | 43 | |
| 2013 | 52 | |
| 2012 | 67 | |
| 2011 | 77 | |
| 2010 | 114 | |
| 2009 | 132 | |
| 2008 | 249 | |
| 2007 | 367 | |
| 2006 | 400 | |
| 2005 | 421 | |
| 2004 | 386 | |
| 2003 | 339 | |
| 2002 | 340 | |
| 2001 | 293 | |
| 2000 | 302 | |
| 1999 | 315 | |
| 1998 | 279 | |
| 1997 | 276 | |
| 1996 | 278 | |
| 1995 | 244 | |
| 1994 | 268 | |
| 1993 | 232 | |
| 1992 | 197 | |
| 1991 | 180 | |
| 1990 | 157 | |
| 1989 | 156 | |
| 1988 | 114 | |
| 1987 | 104 | |
| 1986 | 80 | |
| 1985 | 77 | |
| 1984 | 70 | |
| 1983 | 49 | |
| 1982 | 45 | |
| 1981 | 37 | |
| 1980 | 45 | |
| 1979 | 32 | |
| 1978 | 20 | |
| 1977 | 32 | |
| 1976 | 17 | |
| 1975 | 11 | |
| 1974 | 1 | |
| 1973 | ||
| 1972 | 2 | |
| 1971 | ||
| 1970 | ||
| 1969 | ||
| 1968 | 4 | |
| 1967 | 2 | |
| 1966 | 4 | |