73% (1987)

68% (1986)

69% (1998)

68% (1990)

69% (1987)

65% (1984)

67% (1990)

58% (1998)

67% (1987)

63% (1994)

63% (1985)

65% (1987)

58% (1988)

67% (1992)

54% (1988)

61% (1987)

60% (1996)

49% (1987)

60% (1985)

56% (1989)