72% (1991)

65% (1997)

63% (1996)

60% (1994)

75% (1992)

57% (1994)

60% (1996)

63% (1998)

68% (1996)

55% (1997)

63% (1998)

47% (1997)

47% (1996)

65% (1993)

70% (1991)

62% (1992)

46% (1996)

55% (1999)

59% (1991)

57% (1998)