69% (1992)

62% (1999)

62% (1988)

69% (1989)

73% (1995)

72% (1998)

61% (1997)

63% (1990)

62% (1987)

70% (1995)

69% (2000)

65% (1984)

66% (1989)

73% (1992)

60% (1988)

63% (1991)

59% (1990)

63% (1998)

55% (1999)

41% (1996)