43% (1987)

20% (1992)

20% (2003)

50% (1989)

20% (1990)

35% (1998)

30% (1988)

40% (2001)

57% (1989)

20% (1990)

20% (1993)

20% (1988)

20% (1993)

20% (1998)

47% (1983)

20% (1999)

40% (1986)

0% (2011)

55% (2002)

0% (1996)