72% (1998)

73% (1992)

63% (1991)

61% (1999)

61% (1997)

69% (1989)

70% (1995)

63% (1987)

63% (1990)

65% (1984)

69% (1992)

63% (1998)

72% (1995)

61% (1988)

66% (1989)

56% (1999)

59% (1990)

56% (1987)

62% (1996)

60% (1988)