76% (1967)

68% (1990)

62% (2000)

58% (2005)

62% (2001)

51% (1990)

62% (1991)

69% (2001)

67% (1992)

50% (2011)

57% (2000)

63% (2003)

41% (1992)

59% (2001)

58% (2007)

50% (1967)

46% (1989)

46% (1991)

58% (1991)

55% (1966)