79% (1999)

69% (1998)

72% (1997)

78% (1994)

70% (2003)

68% (2001)

58% (2006)

76% (2000)

52% (2005)

68% (2000)

72% (1996)

49% (2006)

0% (1964)

70% (1999)

58% (1996)

65% (2002)

80% (1998)

69% (1999)

67% (1997)

62% (2000)