73% (1987)

68% (1986)

69% (1998)

59% (1998)

67% (1990)

65% (1984)

69% (1987)

68% (1990)

66% (1987)

67% (1992)

65% (1987)

63% (1994)

49% (1987)

60% (1996)

63% (1985)

57% (1988)

54% (1988)

60% (1987)

56% (1989)

45% (1989)