| Year | Count |
|---|---|
| 1927 | 10 |
| 1929 | 10 |
| 1939 | 5 |
| 1945 | 5 |
| 1950 | 5 |
| 1951 | 5 |
| 1954 | 5 |
| 1956 | 5 |
| 1957 | 16 |
| 1958 | 14 |
| 1959 | 16 |
| 1960 | 10 |
| 1962 | 6 |
| 1964 | 5 |
| 1967 | 7 |
| 1970 | 6 |
| 1973 | 5 |
| 1975 | 6 |
| 1979 | 10 |
| 1991 | 5 |
| 1992 | 5 |
| 1997 | 5 |
| 1998 | 8 |
| 1999 | 8 |
| 2000 | 12 |
| 2001 | 26 |
| 2002 | 29 |
| 2003 | 45 |
| 2004 | 56 |
| 2005 | 64 |
| 2006 | 46 |
| 2007 | 66 |
| 2008 | 72 |
| 2009 | 72 |
| 2010 | 61 |
| 2011 | 60 |
| 2012 | 52 |
| 2013 | 41 |
| 2014 | 66 |
| 2015 | 52 |
| 2016 | 156 |
| 2017 | 150 |
| 2018 | 36 |
| 2019 | 96 |
| 2020 | 80 |
| 2021 | 92 |
| 2022 | 70 |
| 2023 | 86 |
| 2024 | 80 |