1919
1923
1925
1931
1933
1933
1934
1935
1935
1936
1936
1937
1938
1938
1938
1939
1939
1939 – 1939
5 events, back to back
1940
1940
1940 – 1940
4 events, back to back
1940
1941
1941
1941
1941 – 1942
4 events, back to back
1942
1942
1942
1942
1943
1943
1943
1944
1944
1944
1944
1944
1945
1945
1945 – 1945
3 events, back to back
1945 – 1945
6 events, back to back
1945