71% (1987)

74% (1991)

59% (1999)

76% (1986)

66% (1986)

60% (1975)

68% (1973)

67% (1975)

70% (1999)

53% (1988)

64% (2001)

73% (1986)

72% (1996)

40% (1995)

33% (1987)

50% (1993)

50% (1992)

45% (1988)

77% (1997)

50% (1992)