76% (2005)

68% (1985)

48% (1986)

0% (1997)

70% (1992)

72% (1987)

90% (1978)

70% (1990)

68% (1979)

60% (1991)

80% (1997)

0% (2003)

60% (1988)

0% (2002)

50% (1978)

65% (1981)

0% (2001)

60% (2004)

0% (1979)

0% (1994)