79% (1990)

44% (1993)

63% (1994)

66% (1996)

66% (2000)

70% (1988)

70% (2010)

72% (1989)

72% (2004)

65% (1989)

71% (1993)

65% (2006)

64% (1990)

56% (1999)

55% (1996)

68% (1997)

98% (1991)