20% (1984)

60% (1993)

20% (1990)

20% (1999)

20% (1997)

0% (1999)

20% (1994)

35% (1998)

20% (1985)

50% (1993)

20% (1984)

20% (2000)

47% (1995)

20% (1999)

20% (1994)

20% (1996)

20% (1999)

60% (1999)

20% (1996)

80% (1996)