58% (1996)

56% (2001)

49% (1998)

40% (1995)

55% (1991)

63% (1997)

60% (1992)

52% (1993)

72% (1990)

50% (1990)

40% (1996)

47% (1993)

50% (1992)

30% (1992)

47% (1998)

67% (1997)

57% (1996)

43% (1995)

38% (1991)

59% (1994)