63% (1983)

62% (1997)

77% (1986)

60% (1976)

61% (1981)

68% (1993)

76% (1967)

61% (1976)

62% (1988)

47% (1984)

70% (1976)

63% (1980)

58% (1985)

70% (1995)

61% (1986)

72% (1969)

64% (1996)

66% (2007)

61% (1974)

62% (1977)