| Year | Count |
|---|---|
| 1981 | 115 |
| 1982 | 370 |
| 1983 | 15 |
| 1983 | 342 |
| 1984 | 271 |
| 1985 | 12 |
| 1985 | 353 |
| 1986 | 10 |
| 1986 | 242 |
| 1987 | 212 |
| 1988 | 214 |
| 1989 | 133 |
| 1990 | 161 |
| 1991 | 10 |
| 1991 | 121 |
| 1992 | 124 |
| 1993 | 10 |
| 1993 | 100 |
| 1994 | 82 |
| 1995 | 160 |
| 1996 | 5 |
| 1996 | 124 |
| 1997 | 123 |
| 1998 | 113 |
| 1999 | 146 |
| 2000 | 217 |
| 2001 | 211 |
| 2002 | 210 |
| 2003 | 402 |
| 2004 | 14 |
| 2004 | 548 |
| 2005 | 517 |
| 2006 | 543 |
| 2007 | 557 |
| 2008 | 773 |
| 2009 | 734 |
| 2010 | 6 |
| 2010 | 963 |
| 2011 | 999 |
| 2012 | 1,105 |
| 2013 | 875 |
| 2014 | 749 |
| 2015 | 684 |
| 2016 | 547 |
| 2017 | 503 |
| 2018 | 398 |
| 2019 | 322 |
| 2020 | 305 |
| 2021 | 308 |
| 2022 | 257 |
| 2023 | 191 |
| 2024 | 159 |