72% (1987)

68% (1986)

58% (1998)

69% (1998)

65% (1984)

69% (1987)

67% (1990)

68% (1990)

57% (1988)

63% (1994)

0% (1992)

63% (1985)

65% (1987)

67% (1992)

53% (1988)

60% (1985)

67% (1987)

61% (1987)

49% (1987)

60% (1996)