74% (1997)

74% (1999)

66% (1997)

54% (1995)

73% (1995)

64% (1992)

54% (1996)

74% (1998)

66% (1993)

70% (1996)

57% (1997)

62% (1997)

52% (1996)

50% (1996)

55% (1999)

50% (1996)

50% (1992)

50% (1996)

62% (1993)

44% (1992)