| Year | Count |
|---|---|
| 1975 | 5 |
| 1978 | 6 |
| 1979 | 18 |
| 1980 | 34 |
| 1981 | 67 |
| 1981 | 5 |
| 1982 | 127 |
| 1983 | 327 |
| 1984 | 359 |
| 1985 | 482 |
| 1986 | 598 |
| 1987 | 592 |
| 1988 | 547 |
| 1989 | 496 |
| 1990 | 371 |
| 1991 | 433 |
| 1992 | 335 |
| 1993 | 305 |
| 1994 | 203 |
| 1995 | 203 |
| 1996 | 191 |
| 1997 | 193 |
| 1998 | 160 |
| 1999 | 177 |
| 2000 | 121 |
| 2001 | 160 |
| 2002 | 134 |
| 2003 | 149 |
| 2004 | 256 |
| 2005 | 414 |
| 2006 | 297 |
| 2007 | 289 |
| 2008 | 263 |
| 2009 | 175 |
| 2010 | 131 |
| 2011 | 110 |
| 2012 | 82 |
| 2013 | 59 |
| 2014 | 41 |
| 2015 | 105 |
| 2016 | 107 |
| 2017 | 88 |
| 2018 | 64 |
| 2019 | 94 |
| 2020 | 83 |
| 2021 | 75 |
| 2022 | 104 |
| 2023 | 139 |
| 2024 | 215 |