60% (1974)

76% (1986)

60% (1972)

61% (1997)

61% (1995)

76% (1967)

57% (2007)

78% (1969)

59% (1976)

69% (1971)

70% (1995)

56% (2002)

69% (1976)

71% (1969)

65% (1977)

63% (1997)

77% (1986)

63% (1983)

64% (1991)

62% (1988)