50% (1989)

20% (1992)

57% (1989)

20% (2003)

20% (1997)

35% (1998)

35% (1987)

20% (1988)

20% (1999)

71% (1998)

20% (1983)

20% (1994)

45% (1984)

47% (1995)

20% (1990)

20% (1985)

47% (1983)

40% (1986)

20% (2002)

30% (1988)