| Year | Count |
|---|---|
| 1917 | 6 |
| 1920 | 7 |
| 1921 | 6 |
| 1922 | 6 |
| 1923 | 10 |
| 1927 | 6 |
| 1928 | 6 |
| 1929 | 5 |
| 1931 | 10 |
| 1932 | 15 |
| 1935 | 10 |
| 1937 | 6 |
| 1939 | 5 |
| 1940 | 5 |
| 1941 | 5 |
| 1942 | 28 |
| 1943 | 11 |
| 1944 | 12 |
| 1945 | 6 |
| 1946 | 5 |
| 1947 | 8 |
| 1948 | 21 |
| 1949 | 5 |
| 1950 | 24 |
| 1951 | 10 |
| 1952 | 16 |
| 1955 | 6 |
| 1956 | 5 |
| 1966 | 5 |
| 1967 | 5 |
| 1975 | 10 |
| 1986 | 6 |
| 1989 | 5 |
| 1990 | 5 |
| 1994 | 6 |
| 1995 | 11 |
| 1996 | 10 |
| 1997 | 11 |
| 1998 | 25 |
| 1999 | 20 |
| 2000 | 25 |
| 2001 | 20 |
| 2009 | 10 |
| 2014 | 12 |
| 2016 | 14 |
| 2017 | 30 |
| 2018 | 15 |
| 2019 | 6 |
| 2020 | 10 |
| 2021 | 10 |
| 2022 | 15 |
| 2023 | 6 |