61% (1995)

61% (1997)

62% (1974)

59% (1976)

77% (1986)

78% (1969)

70% (1995)

60% (1974)

60% (1972)

64% (1991)

54% (1983)

76% (1967)

57% (2007)

69% (1971)

61% (1977)

56% (2002)

69% (1976)

71% (1969)

63% (1997)

75% (1983)