74% (1974)

67% (1980)

70% (1976)

71% (1982)

72% (1981)

68% (1986)

65% (1985)

65% (1967)

57% (1996)

67% (1967)

64% (1982)

61% (1972)

63% (1980)

74% (1967)

54% (2008)

73% (1973)

70% (1993)

68% (1977)

72% (1973)

60% (1968)