81% (1995)

66% (1994)

71% (1993)

71% (1999)

63% (1997)

70% (1996)

57% (1997)

59% (2001)

66% (1997)

62% (1992)

55% (1991)

46% (1993)

65% (1990)

70% (1986)

75% (1991)

73% (1989)

40% (1997)

43% (1992)

40% (1996)

0% (1996)