75% (2006)

72% (2007)

67% (2006)

62% (2005)

62% (2005)

58% (1994)

54% (2006)

44% (1999)

62% (1993)

62% (2008)

54% (2008)

66% (1997)

58% (2003)

71% (2001)

65% (2002)

52% (2006)

66% (2001)

49% (2007)

72% (1994)

67% (2002)