81% (1962)

51% (1978)

48% (1987)

51% (1973)

43% (1982)

44% (1976)

50% (1961)

0% (1968)

52% (1974)

75% (1963)

45% (1977)

38% (1991)

70% (1957)

63% (1956)

0% (1973)

51% (1974)

35% (1979)

50% (1966)

68% (1972)

50% (1968)