66% (1982)

75% (1980)

62% (1983)

72% (1989)

65% (1987)

65% (1990)

72% (1976)

63% (1988)

72% (1968)

61% (1986)

55% (1999)

61% (1996)

55% (1996)

63% (1976)

70% (1973)

62% (1980)

58% (1979)

55% (1980)

64% (1990)

72% (1966)