81% (1971)

75% (1959)

69% (1975)

73% (1995)

77% (2001)

80% (1974)

70% (2003)

68% (1998)

73% (1982)

78% (1972)

80% (1993)

74% (1996)

71% (1993)

67% (2003)

65% (1999)

79% (1989)

54% (1992)

60% (2002)

70% (1976)

49% (2002)