73% (1987)

69% (1998)

58% (1998)

67% (1986)

63% (1985)

65% (1984)

67% (1990)

56% (1985)

53% (1988)

69% (1990)

67% (1987)

69% (1987)

65% (1987)

63% (1994)

57% (1988)

49% (1987)

46% (1994)

67% (1992)

60% (1985)

60% (1996)