68% (1992)

71% (1995)

55% (2005)

50% (2008)

66% (1994)

74% (1992)

25% (2006)

55% (1985)

40% (1999)

0% (1990)

55% (1996)

64% (2003)

60% (2003)

0% (1970)

86% (1985)

63% (1987)

0% (1990)

60% (1988)

50% (1989)

0% (1997)