| Year | Count |
|---|---|
| 1947 | 10 |
| 1948 | 5 |
| 1950 | 24 |
| 1951 | 5 |
| 1952 | 18 |
| 1953 | 5 |
| 1954 | 6 |
| 1955 | 18 |
| 1956 | 25 |
| 1957 | 8 |
| 1960 | 5 |
| 1961 | 24 |
| 1963 | 5 |
| 1965 | 12 |
| 1967 | 5 |
| 1969 | 5 |
| 1970 | 9 |
| 1972 | 6 |
| 1993 | 5 |
| 2001 | 16 |
| 2002 | 18 |
| 2003 | 133 |
| 2004 | 523 |
| 2005 | 352 |
| 2006 | 856 |
| 2007 | 433 |
| 2008 | 439 |
| 2009 | 391 |
| 2010 | 332 |
| 2011 | 236 |
| 2012 | 412 |
| 2013 | 298 |
| 2014 | 197 |
| 2015 | 231 |
| 2016 | 237 |
| 2017 | 260 |
| 2018 | 97 |
| 2019 | 88 |
| 2020 | 133 |
| 2021 | 96 |
| 2022 | 122 |
| 2023 | 85 |
| 2024 | 51 |