30% (1992)

35% (2005)

64% (1996)

83% (2005)

79% (1990)

40% (1994)

65% (2007)

87% (2007)

60% (2000)

83% (1991)

83% (1986)

52% (2012)

70% (2000)

58% (2007)

90% (2001)

53% (2008)

65% (2009)

71% (2003)

62% (1999)

57% (2005)