66% (1990)

60% (1995)

45% (1994)

67% (1990)

56% (1991)

54% (1992)

59% (1992)

43% (1995)

35% (1996)

48% (1998)

58% (1993)

34% (1996)

40% (1994)

36% (1993)

54% (1995)

30% (1995)

53% (1996)

38% (1994)

32% (1999)

30% (1993)