79% (1994)

81% (1994)

76% (2001)

78% (1986)

69% (2008)

63% (1985)

75% (1996)

63% (2000)

65% (1997)

73% (1999)

67% (2004)

68% (1993)

62% (1986)

55% (2009)

64% (2001)

48% (2009)

70% (1992)

62% (1990)

61% (1973)

100% (1979)