71% (1998)

20% (1988)

57% (1989)

50% (1989)

20% (2003)

60% (1990)

35% (1998)

20% (1992)

47% (1983)

20% (1993)

60% (2000)

60% (1999)

43% (1987)

20% (1999)

20% (1990)

20% (1985)

30% (1988)

60% (1993)

32% (1994)

47% (1995)