73% (1978)

67% (1967)

68% (1969)

58% (1969)

71% (1996)

72% (1998)

60% (1996)

72% (1962)

81% (2004)

72% (1976)

60% (1994)

79% (1970)

68% (1973)

72% (1994)

58% (1988)

65% (1992)

70% (1978)

70% (1974)

77% (1980)

67% (1973)