66% (1982)

65% (1987)

62% (1983)

65% (1990)

76% (1980)

72% (1989)

56% (1980)

69% (1977)

72% (1966)

64% (1990)

70% (1973)

63% (1988)

59% (1980)

72% (1976)

61% (1996)

59% (1982)

62% (1986)

72% (1968)

56% (1999)

71% (1972)