73% (1998)

72% (1992)

61% (1997)

70% (1995)

62% (1988)

69% (1989)

61% (1999)

69% (1992)

63% (1990)

73% (1995)

64% (1991)

65% (1984)

65% (1989)

60% (1988)

69% (2000)

63% (1998)

50% (2003)

57% (1990)

56% (1987)

67% (1997)