| Year | Count |
|---|---|
| 1973 | 5 |
| 1983 | 5 |
| 1984 | 7 |
| 1985 | 5 |
| 1987 | 9 |
| 1990 | 7 |
| 1991 | 7 |
| 1992 | 5 |
| 2002 | 15 |
| 2005 | 10 |
| 2006 | 5 |
| 2007 | 17 |
| 2008 | 42 |
| 2009 | 98 |
| 2010 | 177 |
| 2011 | 267 |
| 2012 | 47 |
| 2012 | 309 |
| 2013 | 115 |
| 2013 | 370 |
| 2014 | 185 |
| 2014 | 522 |
| 2015 | 426 |
| 2015 | 791 |
| 2016 | 476 |
| 2016 | 911 |
| 2017 | 544 |
| 2017 | 988 |
| 2018 | 486 |
| 2018 | 1,191 |
| 2019 | 404 |
| 2019 | 1,302 |
| 2020 | 540 |
| 2020 | 1,360 |
| 2021 | 582 |
| 2021 | 1,708 |
| 2022 | 580 |
| 2022 | 1,682 |
| 2023 | 577 |
| 2023 | 1,486 |
| 2024 | 475 |
| 2024 | 1,482 |