20% (1984)

50% (1993)

40% (1986)

20% (1990)

32% (1994)

0% (1986)

0% (1996)

60% (1990)

20% (1983)

0% (1984)

0% (1999)

20% (1997)

55% (2002)

20% (1994)

40% (1995)

40% (1999)

20% (1991)

20% (1995)

20% (1992)

20% (1999)