| 1936 | 1948 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1956 |
 |
| Stylised Owl |
| 1955 | 1958 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1962 | 1971 |
 |
 |
| Cover | |
| Stylised Owl | Stylised Owl |
| 1976 | 1981 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1984 | 1986 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1988 | 1998 |
 |
 |
| Stylised Owl | Stylised Owl |
| 2000 | 2002 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1959 | 1963 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1963 | 1965 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1966 | 1967 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1969 | 1973 |
 |
 |
| Stylised Owl | Stylised Owl |
| 19xx | 1969 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1968 |
 |
| Stylised Owl |
| 1971 | 1991 |
 |
 |
| Cover | Cover |
| Stylised Owl | Stylised Owl |
| 1972 | 1973 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1977 | 1976 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1981 | 1981 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1981 | 1981 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1981 |
 |
| Stylised Owl |
| 1981 | 1982 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1982 | 1987 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1982 | 1982 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1984 | 1985 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1985 |
 |
| Stylised Owl |
| 1986 | 1991 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1986 |
 |
| Stylised Owl |
| 1987 | 1992 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1987 | 1987 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1987 |
 |
| Stylised Owl |
| 1988 | 1988 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1993 |
 |
| Cover |
| Stylised Owl |
| 1989 | 1990 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1990 | 1997 |
 |
 |
| Cover | |
| Stylised Owl | Stylised Owl |
| 1998 | 2005 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 1990 | 1990 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1992 | 1992 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1992 |
 |
| Stylised Owl |
| 1994 | 1995 |
 |
 |
| Stylised Owl | Stylised Owl |
| 1995 | 1996 |
 |
 |
| Cover | |
| Cover | |
| Stylised Owl | Stylised Owl |
| 1996 | 1996 |
 |
 |
| Stylised Owl | Stylised Owl |
| 2001 | 2003 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 1997 | 1999 |
 |
 |
| Stylised Owl |
Stylised Owl |
| 1997 |
 |
| Stylised Owl |
| 1998 | 2002 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 1998 |
 |
| Stylised Owl |
| 2000 | 2002 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 2001 | 2002 |
 |
 |
|
Stylised Owl |
Stylised Owl |
| 2002 |
 |
|
Stylised Owl |
| 2003 | 2003 |
 |
 |
| Stylised Owl |
Stylised Owl |
| 2004 |
 |
|
Stylised Owl |