| Year | Count |
|---|---|
| 1954 | 5 |
| 1960 | 14 |
| 1961 | 5 |
| 1965 | 5 |
| 1981 | 5 |
| 1982 | 6 |
| 1983 | 5 |
| 1984 | 6 |
| 1986 | 13 |
| 1987 | 5 |
| 1988 | 19 |
| 1989 | 15 |
| 1990 | 22 |
| 1991 | 35 |
| 1992 | 56 |
| 1993 | 53 |
| 1994 | 74 |
| 1995 | 97 |
| 1996 | 112 |
| 1997 | 207 |
| 1998 | 213 |
| 1999 | 337 |
| 2000 | 254 |
| 2001 | 308 |
| 2002 | 329 |
| 2003 | 427 |
| 2004 | 424 |
| 2005 | 453 |
| 2006 | 426 |
| 2007 | 546 |
| 2008 | 493 |
| 2009 | 526 |
| 2010 | 594 |
| 2011 | 489 |
| 2012 | 616 |
| 2013 | 675 |
| 2014 | 708 |
| 2015 | 775 |
| 2016 | 1,007 |
| 2017 | 1,097 |
| 2018 | 1,209 |
| 2019 | 1,561 |
| 2020 | 1,860 |
| 2021 | 2,674 |
| 2022 | 3,379 |
| 2023 | 3,764 |
| 2024 | 3,820 |