81% (1971)

75% (1959)

73% (1995)

70% (2003)

73% (1982)

70% (1975)

68% (1998)

74% (1996)

80% (1974)

80% (1993)

78% (1972)

71% (1993)

54% (1992)

65% (1999)

49% (2002)

70% (1976)

70% (1996)

78% (1989)

59% (2004)

68% (1998)