93% (1985)

83% (1999)

80% (2001)

74% (1990)

100% (1998)

70% (1994)

65% (1993)

60% (1997)

69% (1996)

72% (1998)

65% (1987)

69% (2004)

71% (1999)

90% (1975)

70% (1995)

84% (1982)

80% (1983)

0% (1980)

50% (1976)

78% (1995)