75% (2006)

72% (2007)

67% (2006)

62% (1993)

53% (2006)

62% (2005)

71% (2001)

66% (1997)

62% (2008)

49% (2007)

58% (1994)

65% (2002)

67% (2002)

62% (2005)

59% (2009)

54% (2008)

66% (2001)

71% (1994)

58% (2003)

44% (1999)