| Year | Count |
|---|---|
| 1969 | 5 |
| 1979 | 10 |
| 1981 | 22 |
| 1982 | 9 |
| 1983 | 16 |
| 1984 | 29 |
| 1985 | 43 |
| 1986 | 58 |
| 1987 | 159 |
| 1988 | 155 |
| 1989 | 220 |
| 1990 | 263 |
| 1991 | 221 |
| 1992 | 267 |
| 1993 | 237 |
| 1994 | 280 |
| 1995 | 178 |
| 1996 | 338 |
| 1997 | 590 |
| 1998 | 724 |
| 1999 | 2,011 |
| 2000 | 1,471 |
| 2001 | 1,139 |
| 2002 | 1,014 |
| 2003 | 939 |
| 2004 | 1,090 |
| 2004 | 12 |
| 2005 | 1,062 |
| 2006 | 888 |
| 2007 | 858 |
| 2008 | 819 |
| 2009 | 737 |
| 2010 | 641 |
| 2011 | 699 |
| 2012 | 699 |
| 2013 | 704 |
| 2014 | 685 |
| 2015 | 724 |
| 2016 | 673 |
| 2017 | 643 |
| 2018 | 452 |
| 2019 | 504 |
| 2020 | 431 |
| 2021 | 315 |
| 2022 | 343 |
| 2023 | 265 |
| 2024 | 237 |