| Year | Count |
|---|---|
| 1968 | 10 |
| 1969 | 5 |
| 1971 | 6 |
| 1974 | 6 |
| 1989 | 5 |
| 1996 | 7 |
| 1997 | 21 |
| 2001 | 15 |
| 2002 | 5 |
| 2003 | 25 |
| 2004 | 72 |
| 2005 | 64 |
| 2006 | 92 |
| 2007 | 76 |
| 2008 | 50 |
| 2009 | 39 |
| 2010 | 36 |
| 2011 | 70 |
| 2012 | 58 |
| 2013 | 25 |
| 2014 | 22 |
| 2015 | 55 |
| 2016 | 91 |
| 2017 | 128 |
| 2018 | 87 |
| 2019 | 61 |
| 2020 | 85 |
| 2021 | 43 |
| 2022 | 53 |
| 2023 | 31 |
| 2024 | 23 |