47% (1997)

52% (1996)

30% (1993)

52% (1997)

100% (1997)

61% (1997)

30% (1994)

52% (1990)

51% (1993)

76% (1989)

43% (1992)

45% (1995)

44% (1994)

44% (1993)

56% (1991)

42% (1994)

57% (1990)

24% (1991)

32% (1998)

50% (1990)