80% (1994)

77% (1986)

76% (2001)

69% (2008)

74% (1999)

62% (1980)

63% (1985)

82% (1994)

64% (2000)

65% (1997)

75% (1996)

62% (1986)

61% (1973)

48% (2009)

55% (2002)

62% (1990)

75% (1994)

64% (1999)

67% (2004)

60% (1996)