50% (1993)

20% (1984)

40% (1998)

20% (1985)

40% (1995)

20% (2001)

20% (1985)

0% (1992)

20% (1983)

20% (1994)

20% (1999)

20% (1996)

20% (1991)

40% (1986)

20% (1984)

20% (1986)

20% (1985)

0% (1990)

0% (1992)

20% (1984)