58% (1967)

61% (1980)

54% (1977)

50% (1966)

28% (1985)

70% (1991)

50% (1960)

80% (1981)

65% (1982)

52% (1958)

48% (1970)

62% (1982)

60% (1964)

50% (1982)

52% (1984)

10% (1974)

37% (1972)

42% (1954)

0% (1977)

75% (1962)