30% (1997)

49% (1990)

36% (1997)

35% (1990)

53% (1994)

40% (1994)

0% (1988)

42% (1995)

54% (1993)

49% (1987)

33% (1996)

30% (1994)

30% (1993)

39% (1995)

45% (1994)

41% (1998)

20% (1989)

51% (1994)

20% (1999)

63% (1999)