63% (1995)

64% (1997)

52% (1991)

39% (1990)

44% (1994)

30% (1999)

30% (1992)

40% (1998)

55% (1993)

42% (1992)

67% (1999)

43% (1990)

36% (1997)

49% (1998)

50% (1995)

45% (2000)

38% (1998)

56% (1999)

67% (1987)

43% (1999)