76% (1967)

67% (1990)

62% (2000)

58% (2005)

51% (1990)

62% (2001)

69% (2001)

62% (1991)

50% (2011)

67% (1992)

41% (1992)

50% (1967)

57% (2000)

58% (2007)

63% (2003)

59% (2001)

46% (1989)

50% (1991)

40% (1962)

58% (1991)