66% (1990)

60% (1995)

54% (1992)

66% (1990)

56% (1991)

48% (1998)

59% (1992)

45% (1994)

54% (1995)

42% (1995)

30% (1995)

58% (1993)

35% (1996)

53% (1996)

40% (1994)

34% (1996)

38% (1994)

38% (1999)

30% (1993)

42% (1998)