| Year | Count |
|---|---|
| 1974 | 32 |
| 1975 | 71 |
| 1976 | 97 |
| 1977 | 302 |
| 1978 | 327 |
| 1979 | 388 |
| 1980 | 320 |
| 1981 | 315 |
| 1982 | 269 |
| 1983 | 204 |
| 1984 | 148 |
| 1985 | 150 |
| 1986 | 659 |
| 1987 | 647 |
| 1988 | 584 |
| 1989 | 710 |
| 1990 | 717 |
| 1991 | 631 |
| 1992 | 712 |
| 1993 | 633 |
| 1994 | 689 |
| 1995 | 544 |
| 1996 | 501 |
| 1997 | 442 |
| 1998 | 391 |
| 1999 | 288 |
| 2000 | 357 |
| 2001 | 350 |
| 2002 | 394 |
| 2003 | 342 |
| 2004 | 341 |
| 2005 | 271 |
| 2006 | 441 |
| 2007 | 494 |
| 2008 | 481 |
| 2009 | 458 |
| 2010 | 480 |
| 2011 | 402 |
| 2012 | 283 |
| 2013 | 289 |
| 2014 | 266 |
| 2015 | 292 |
| 2016 | 250 |
| 2017 | 309 |
| 2018 | 220 |
| 2019 | 222 |
| 2020 | 148 |
| 2021 | 151 |
| 2022 | 123 |
| 2023 | 71 |
| 2024 | 68 |