76% (1967)

68% (1990)

63% (2000)

69% (2001)

62% (1991)

52% (1990)

59% (2005)

62% (2001)

56% (2000)

41% (1992)

67% (1992)

50% (2009)

50% (1991)

58% (2007)

58% (1991)

62% (2003)

50% (1967)

59% (2001)

37% (1966)

34% (1962)