80% (1994)

74% (1998)

72% (2006)

78% (1987)

59% (1999)

77% (1983)

66% (2000)

70% (1982)

84% (1984)

60% (1994)

46% (2000)

67% (2003)

68% (1981)

40% (2005)

63% (1980)

62% (1983)

48% (2006)

68% (1996)

70% (1980)

60% (1994)