73% (1987)

69% (1998)

65% (1984)

67% (1986)

59% (1998)

67% (1990)

69% (1987)

68% (1990)

67% (1987)

67% (1992)

63% (1985)

60% (1985)

57% (1988)

49% (1987)

63% (1994)

65% (1987)

53% (1988)

56% (1985)

60% (1987)

60% (1996)