| Year | Count |
|---|---|
| 1915 | 10 |
| 1917 | 5 |
| 1920 | 5 |
| 1921 | 5 |
| 1926 | 5 |
| 1927 | 6 |
| 1939 | 10 |
| 1940 | 6 |
| 1947 | 5 |
| 1948 | 30 |
| 1950 | 15 |
| 1954 | 23 |
| 1955 | 15 |
| 1956 | 17 |
| 1957 | 32 |
| 1958 | 35 |
| 1959 | 20 |
| 1960 | 15 |
| 1963 | 20 |
| 1964 | 5 |
| 1966 | 12 |
| 1967 | 12 |
| 1970 | 5 |
| 1977 | 10 |
| 1980 | 8 |
| 1982 | 6 |
| 1986 | 5 |
| 1989 | 7 |
| 1990 | 10 |
| 1992 | 15 |
| 1993 | 11 |
| 1994 | 6 |
| 1995 | 42 |
| 1996 | 54 |
| 1997 | 56 |
| 1998 | 25 |
| 1999 | 25 |
| 2000 | 19 |
| 2001 | 63 |
| 2002 | 46 |
| 2003 | 45 |
| 2004 | 33 |
| 2005 | 48 |
| 2006 | 26 |
| 2007 | 52 |
| 2008 | 46 |
| 2009 | 34 |
| 2010 | 47 |
| 2011 | 50 |
| 2012 | 21 |
| 2013 | 74 |
| 2014 | 51 |
| 2015 | 100 |
| 2016 | 125 |
| 2017 | 140 |
| 2018 | 78 |
| 2019 | 123 |
| 2020 | 159 |
| 2021 | 230 |
| 2022 | 336 |
| 2023 | 365 |
| 2024 | 391 |