51% (1992)

56% (1993)

50% (2005)

35% (2004)

35% (2005)

45% (1999)

60% (1993)

69% (1998)

0% (1989)

20% (1987)

35% (1999)

10% (1999)

30% (1999)

0% (1971)

20% (1972)

20% (1996)

40% (2002)

20% (1984)

10% (1995)

52% (1988)