66% (1990)

60% (1995)

45% (1994)

56% (1991)

54% (1992)

67% (1990)

59% (1992)

30% (1995)

58% (1993)

33% (1996)

43% (1995)

40% (1994)

39% (1993)

47% (1998)

32% (1994)

36% (1993)

53% (1996)

54% (1995)

35% (1996)

32% (1999)