| Year | Count |
|---|---|
| 1976 | 233 |
| 1977 | 493 |
| 1978 | 517 |
| 1979 | 451 |
| 1980 | 379 |
| 1981 | 370 |
| 1982 | 332 |
| 1983 | 320 |
| 1984 | 356 |
| 1985 | 253 |
| 1986 | 266 |
| 1987 | 235 |
| 1988 | 199 |
| 1989 | 267 |
| 1990 | 287 |
| 1991 | 296 |
| 1992 | 307 |
| 1993 | 299 |
| 1994 | 360 |
| 1995 | 306 |
| 1996 | 242 |
| 1997 | 316 |
| 1998 | 614 |
| 1999 | 668 |
| 2000 | 611 |
| 2001 | 553 |
| 2002 | 462 |
| 2003 | 489 |
| 2004 | 505 |
| 2005 | 387 |
| 2006 | 445 |
| 2007 | 281 |
| 2008 | 214 |
| 2009 | 161 |
| 2010 | 135 |
| 2011 | 96 |
| 2012 | 70 |
| 2013 | 20 |
| 2014 | 76 |
| 2015 | 54 |
| 2016 | 83 |
| 2017 | 90 |
| 2018 | 78 |
| 2019 | 135 |
| 2020 | 143 |
| 2021 | 217 |
| 2022 | 190 |
| 2023 | 162 |
| 2024 | 105 |