63% (1983)

67% (1990)

71% (1986)

69% (1990)

69% (2004)

66% (1978)

68% (1990)

68% (1996)

77% (1986)

62% (1978)

68% (1987)

66% (1993)

65% (1996)

58% (1988)

66% (1990)

52% (1973)

59% (1993)

52% (1991)

61% (1992)

62% (1988)