72% (1991)

58% (1994)

76% (1992)

65% (1997)

60% (1994)

63% (1992)

60% (1996)

64% (1998)

63% (1996)

65% (1993)

55% (1992)

64% (1997)

56% (1997)

48% (1997)

59% (1991)

56% (1999)

54% (1997)

68% (1996)

46% (1996)

56% (1992)