66% (1990)

60% (1995)

45% (1994)

54% (1992)

67% (1990)

43% (1995)

56% (1991)

35% (1996)

30% (1995)

58% (1993)

59% (1992)

47% (1998)

34% (1994)

33% (1996)

43% (1998)

61% (1959)

53% (1996)

38% (1999)

40% (1994)

54% (1995)