| Year | Count |
|---|---|
| 1914 | 5 |
| 1915 | 6 |
| 1916 | 5 |
| 1917 | 6 |
| 1918 | 14 |
| 1919 | 6 |
| 1920 | 8 |
| 1921 | 5 |
| 1922 | 12 |
| 1923 | 14 |
| 1924 | 10 |
| 1926 | 14 |
| 1928 | 10 |
| 1929 | 16 |
| 1930 | 12 |
| 1931 | 5 |
| 1963 | 6 |
| 1981 | 7 |
| 1998 | 7 |
| 2001 | 6 |
| 2005 | 6 |
| 2008 | 9 |
| 2009 | 6 |
| 2010 | 9 |
| 2011 | 7 |
| 2012 | 10 |
| 2013 | 9 |
| 2014 | 6 |
| 2015 | 18 |
| 2016 | 30 |
| 2017 | 27 |
| 2018 | 18 |
| 2019 | 14 |
| 2020 | 12 |
| 2021 | 20 |
| 2022 | 12 |
| 2024 | 10 |