| Covers listed | |
| 1913: | 29 November, |
| 1924: | 13 December, |
| 1925: | 24 January, 4 April, |
| 1929: | 23 February, |
| 1942: | April, |
| 1944: | January, |
| 1955: | February, May, July, September, November, |
| 1956: | March, November, |
| 1957: | October, |
| 1958: | June, November, December, |
| 1959: | January, May, |
| 1960: | January, May, June, |
| 1961: | May, |
| 1962: | March, April, August, September, October, December, |
| 1963: | January, February, June, July, August, |
| 1964: | January, March, April, November, December, |
| 1965: | June, |
| 1966: | January, May, |
| 1967: | January, August, |
| 1968: | April, July, September, November, |
| 1969: | April, September, |
| 1970: | January, February, |
| 1973: | February, April, |
| 1974: | November, |
| 1975: | July, |
