74% (1992)

56% (1993)

59% (1995)

48% (2000)

56% (1994)

46% (1997)

67% (1997)

53% (1991)

64% (1997)

53% (1993)

54% (1992)

49% (1995)

53% (1995)

41% (1993)

57% (1995)

43% (1993)

53% (1999)

55% (1996)

50% (1998)

47% (1997)