68% (1969)

54% (1991)

81% (2005)

76% (1982)

69% (1990)

72% (1998)

67% (1967)

72% (1976)

72% (1978)

72% (1994)

79% (1970)

60% (1994)

82% (2004)

71% (1996)

71% (1978)

66% (1992)

60% (1983)

68% (1973)

67% (1973)

56% (1982)