74% (1992)

64% (2009)

76% (1997)

65% (1993)

74% (1993)

77% (1997)

71% (1991)

77% (1998)

78% (1995)

76% (1996)

63% (1993)

57% (2004)

71% (1997)

68% (1994)

69% (1995)

75% (1994)

53% (1997)

64% (2010)

62% (1996)

63% (1993)