80% (1996)

81% (1984)

68% (1994)

72% (1993)

72% (1998)

76% (1996)

69% (1992)

70% (1997)

69% (1998)

63% (1994)

70% (1995)

59% (1991)

71% (1994)

68% (1985)

70% (1990)

66% (1999)

75% (1988)

73% (1996)

61% (1986)

62% (1997)