72% (1991)

63% (1996)

63% (1998)

60% (1994)

68% (1996)

57% (1994)

60% (1996)

65% (1997)

63% (1998)

47% (1997)

75% (1992)

55% (1999)

65% (1993)

62% (1992)

54% (1992)

70% (1991)

55% (1997)

59% (1991)

56% (1992)

57% (1998)