| Year | Count |
|---|---|
| 1912 | 14 |
| 1913 | 6 |
| 1914 | 23 |
| 1915 | 44 |
| 1916 | 34 |
| 1917 | 44 |
| 1918 | 49 |
| 1919 | 34 |
| 1920 | 47 |
| 1921 | 71 |
| 1922 | 59 |
| 1923 | 120 |
| 1924 | 105 |
| 1925 | 66 |
| 1926 | 29 |
| 1927 | 90 |
| 1928 | 70 |
| 1929 | 80 |
| 1930 | 47 |
| 1931 | 56 |
| 1932 | 29 |
| 1933 | 12 |
| 1934 | 21 |
| 1935 | 17 |
| 1936 | 6 |
| 1937 | 6 |
| 1938 | 18 |
| 1939 | 10 |
| 1941 | 6 |
| 1942 | 6 |
| 1943 | 11 |
| 1947 | 5 |
| 1959 | 5 |
| 1960 | 7 |
| 1961 | 7 |
| 1971 | 7 |
| 1973 | 8 |
| 1980 | 6 |
| 1995 | 6 |
| 2000 | 5 |
| 2001 | 10 |
| 2002 | 18 |
| 2003 | 14 |
| 2004 | 28 |
| 2005 | 67 |
| 2006 | 52 |
| 2007 | 97 |
| 2008 | 105 |
| 2009 | 115 |
| 2010 | 185 |
| 2011 | 256 |
| 2012 | 231 |
| 2013 | 213 |
| 2014 | 228 |
| 2015 | 136 |
| 2016 | 63 |
| 2017 | 33 |
| 2018 | 10 |