72% (1982)

74% (1964)

66% (1977)

62% (1967)

70% (1969)

67% (1982)

64% (1980)

71% (1970)

66% (1979)

54% (1999)

78% (1987)

50% (1966)

65% (1976)

73% (1974)

66% (1968)

64% (1979)

56% (1976)

50% (1972)

54% (1981)

49% (1983)