30% (1992)

84% (2005)

60% (2000)

87% (2007)

64% (1996)

84% (2003)

81% (1990)

68% (2007)

35% (2005)

60% (2000)

83% (1991)

70% (2001)

67% (2009)

58% (2007)

57% (2005)

70% (2004)

53% (2008)

85% (1992)

62% (1999)

71% (2003)