| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1916 |  |  | ||||||||||
| 1917 |  |  |  | |||||||||
| 1918 |  |  |  | |||||||||
| 1919 |  |  |  | |||||||||
| 1920 |  |  |  |  | ||||||||
| 1921 |  |  |  |  |  |  | ||||||
| 1922 |  |  |  |  |  |  |  |  | ||||
| 1923 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1924 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1925 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1926 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1927 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1928 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1929 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1930 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1931 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1932 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1933 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1934 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1935 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1936 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1937 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1938 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1939 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1940 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1941 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1942 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1943 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1944 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1945 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1946 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1947 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1948 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1949 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1950 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1951 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1952 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1953 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1954 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1955 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1956 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1957 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1958 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1959 |  |  |  |  |  |  |  |  |  |  |  | |
| 1960 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1961 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1962 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1963 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1964 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1965 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1966 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1967 |  |  |  |  |  |  |  | |||||
| 1968 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1969 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1970 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1971 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1972 |  |  |  |  |  |  |  |  |  |  |  |  |
| 1973 |  |  |  | |||||||||
| 1974 |  |  |  |  | ||||||||
| 1975 |  |  |  |  | ||||||||
| 1976 |  |  |  |  | ||||||||
| 1977 |  |  | ||||||||||
| 1978 |  |  |  |  | ||||||||
| 1979 |  |  |  |  | ||||||||
| 1980 |  | |||||||||||
| 1981 |  |
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Blanks in this table represent issues which were not published.