93% (1985)

74% (1990)

80% (2001)

83% (1999)

70% (1994)

100% (1998)

69% (1996)

90% (1975)

65% (1993)

70% (1995)

65% (1987)

72% (1998)

69% (2004)

60% (1997)

71% (1999)

84% (1982)

0% (1980)

80% (1983)

50% (1976)

59% (2004)