73% (1987)

59% (1998)

70% (1998)

68% (1986)

67% (1990)

65% (1984)

69% (1990)

67% (1992)

69% (1987)

63% (1994)

66% (1987)

65% (1987)

60% (1996)

63% (1985)

49% (1987)

60% (1985)

60% (1987)

58% (1988)

53% (1988)

60% (1987)