30% (1992)

60% (2000)

84% (2005)

53% (2008)

50% (1994)

64% (1996)

60% (2000)

81% (1990)

58% (2007)

83% (1991)

59% (2012)

84% (2003)

57% (2005)

70% (2004)

67% (2009)

71% (2003)

62% (1999)

87% (2007)

85% (1992)

35% (2005)