| Year | Count |
|---|---|
| 1951 | 12 |
| 1952 | 27 |
| 1953 | 6 |
| 1954 | 15 |
| 1955 | 7 |
| 1956 | 18 |
| 1957 | 20 |
| 1958 | 87 |
| 1959 | 259 |
| 1960 | 216 |
| 1961 | 227 |
| 1962 | 163 |
| 1963 | 171 |
| 1964 | 148 |
| 1965 | 58 |
| 1966 | 67 |
| 1967 | 38 |
| 1968 | 30 |
| 1969 | 15 |
| 1970 | 22 |
| 1971 | 11 |
| 1972 | 10 |
| 1973 | 5 |
| 1975 | 6 |
| 1976 | 12 |
| 1988 | 10 |
| 1989 | 10 |
| 1996 | 6 |
| 2010 | 5 |
| 2012 | 6 |
| 2016 | 33 |
| 2017 | 15 |
| 2018 | 6 |
| 2019 | 6 |
| 2020 | 39 |
| 2021 | 30 |
| 2022 | 47 |
| 2023 | 32 |
| 2024 | 19 |