66% (2000)

72% (2004)

79% (1990)

70% (2010)

66% (1996)

65% (2006)

45% (1993)

70% (1988)

73% (1989)

71% (1993)

64% (1989)

63% (1994)

64% (1990)

56% (1999)

55% (1996)

68% (1997)

98% (1991)