74% (1992)

59% (1995)

56% (1993)

49% (2000)

46% (1997)

56% (1994)

53% (1991)

64% (1997)

62% (1995)

56% (1996)

52% (1993)

50% (1998)

49% (1995)

43% (1993)

53% (1999)

53% (1992)

63% (1997)

57% (1996)

55% (1995)

48% (1999)