72% (1978)

81% (2004)

67% (1967)

69% (1990)

71% (1996)

72% (1998)

72% (1993)

60% (1996)

78% (1970)

67% (1969)

60% (1994)

54% (1991)

77% (1980)

72% (1976)

71% (1994)

68% (1973)

67% (1973)

66% (1992)

72% (1984)

80% (1997)