20% (1992)

20% (2003)

50% (1989)

43% (1987)

30% (1988)

20% (1984)

47% (1983)

35% (1998)

20% (1998)

20% (1999)

57% (1989)

20% (1988)

47% (1995)

20% (1993)

0% (1991)

20% (1997)

20% (1984)

40% (2001)

40% (1986)

20% (1992)