75% (2006)

72% (2007)

71% (2001)

67% (2006)

63% (1993)

53% (2006)

66% (1997)

62% (2008)

49% (2007)

58% (2003)

58% (1994)

60% (2009)

63% (2005)

63% (2005)

66% (2002)

54% (2008)

71% (1994)

43% (1999)

66% (1997)

65% (2002)