81% (1995)

72% (1999)

66% (1994)

57% (1997)

71% (1993)

66% (2000)

70% (1996)

65% (1990)

40% (1997)

40% (1996)

60% (2001)

64% (1997)

0% (1996)

62% (1992)

66% (1997)

75% (1991)

47% (1993)

73% (1989)

55% (1991)

0% (1987)