66% (1982)

76% (1980)

65% (1987)

62% (1983)

58% (1995)

72% (1976)

72% (1989)

65% (1990)

56% (1999)

58% (1979)

64% (1988)

62% (1986)

69% (1973)

61% (1996)

62% (1980)

72% (1968)

59% (1980)

63% (1976)

59% (1982)

72% (1966)