52% (2012)

70% (2000)

30% (1992)

83% (1991)

40% (1994)

60% (2000)

70% (2005)

83% (2003)

65% (2007)

64% (1996)

79% (1990)

82% (2005)

58% (2007)

62% (1999)

53% (2008)

35% (2005)

60% (2000)

65% (2009)

87% (2007)

70% (2001)