52% (2012)

70% (2000)

83% (1991)

60% (2000)

30% (1992)

40% (1994)

83% (2003)

62% (1999)

65% (2007)

64% (1996)

58% (2007)

82% (2005)

70% (2005)

79% (1990)

65% (2009)

60% (2000)

35% (2005)

71% (2003)

87% (2007)

70% (2001)