75% (1980)

72% (1989)

58% (1979)

65% (1990)

55% (1980)

66% (1982)

56% (1999)

70% (1973)

59% (1982)

72% (1976)

65% (1987)

62% (1986)

62% (1983)

72% (1966)

64% (1990)

63% (1980)

69% (1977)

62% (1978)

72% (1968)

59% (1980)