75% (1997)

73% (1995)

66% (1997)

74% (1999)

64% (1992)

74% (1998)

66% (1993)

54% (1996)

54% (1995)

57% (1997)

71% (1996)

52% (1996)

52% (1997)

55% (1999)

50% (1996)

50% (1996)

67% (1998)

54% (2000)

62% (1997)

62% (1993)