72% (1989)

75% (1980)

66% (1990)

65% (1982)

63% (1983)

61% (1986)

72% (1966)

56% (1999)

65% (1987)

70% (1973)

72% (1968)

56% (1980)

72% (1976)

63% (1978)

57% (1979)

70% (1977)

63% (1976)

58% (1978)

64% (1990)

61% (1996)