76% (1997)

74% (1993)

77% (1997)

64% (2009)

70% (1997)

71% (1991)

77% (1998)

77% (1995)

68% (1994)

57% (2004)

65% (1993)

63% (1993)

68% (1995)

75% (1996)

74% (1994)

64% (2010)

62% (1993)

53% (1997)

64% (1991)

58% (2009)