76% (2005)

68% (1985)

0% (1997)

48% (1986)

50% (1978)

60% (1988)

70% (1992)

72% (1987)

60% (2004)

70% (1990)

50% (1976)

0% (2002)

0% (1994)

68% (1979)

65% (1981)

0% (2003)

60% (1991)

80% (1997)

90% (1978)

0% (1996)