| Covers listed |
|
| 1951: | 31 January, |
| 1952: | 16 July, |
| 1955: | 23 March, 4 May, |
| 1956: | 5 September, |
| 1957: | 9 January, 12 June, |
| 1959: | 22 July, |
| 1960: | 11 May, |
| 1961: | 26 April, 2 August, |
| 1962: | 29 August, |
| 1963: | 31 July, |
| 1966: | 9 March, |
| 1969: | 8 October, |
| 1975: | 16 January, 8 May, 12 June, 8 July, 18 December, |
| 1976: | 18 March, 25 March, 1 May, 6 May, 15 July, 19 August, 28 October, 2 December, |
| 1977: | 13 January, 7 April, 9 June, 7 July, 24 July, 11 August, 25 August, 1 September, 8 September, 20 October, |
| 1978: | 5 January, 23 February, 9 March, 16 March, 23 March, |
| 1979: | 18 October, |
| 1980: | 17 January, 26 November, |
| 1989: | 8 August, 26 September, |
| 1994: | 16 November, |
| 2001: | 16 July, 23 July, 15 October, |
| 2002: | 14 January, 21 January, 4 February, 18 February, 1 April, 8 April, 8 July, 9 December, |
| 2003: | 17 February, 10 March, 5 May, |
| 2004: | 12 January, 16 February, 23 February, 7 June, 14 June, 20 September, 27 September, 4 October, |
| 2005: | 14 February, 27 June, 1 August, 12 December, |
| 2006: | 7 August, 28 August, 11 December, |
| 2007: | 9 April, 2 July, |
