82% (2005)

30% (1992)

71% (2003)

60% (2000)

64% (1996)

35% (2005)

70% (2001)

87% (2007)

40% (1994)

65% (2007)

53% (2008)

52% (2012)

83% (1991)

70% (2005)

70% (2000)

56% (2009)

83% (2003)

81% (1990)

83% (1986)

42% (2007)