81% (1971)

69% (1975)

73% (1995)

75% (1959)

80% (1974)

69% (1998)

70% (2003)

73% (1982)

78% (1972)

80% (1993)

71% (1993)

74% (1996)

54% (1992)

49% (2002)

65% (1999)

70% (1976)

70% (1996)

78% (1989)

65% (2002)

68% (1977)