60% (1962)

80% (1990)

81% (1984)

65% (1993)

74% (2004)

80% (1981)

62% (2005)

60% (2002)

78% (1998)

72% (2005)

67% (2004)

67% (1984)

73% (1999)

65% (2003)

69% (1992)

59% (2002)

80% (1970)

64% (2002)

72% (1993)

64% (1995)