73% (1987)

69% (1998)

67% (1986)

65% (1984)

67% (1990)

67% (1987)

59% (1998)

69% (1987)

63% (1985)

65% (1987)

68% (1990)

63% (1994)

56% (1985)

57% (1988)

53% (1988)

60% (1996)

60% (1987)

67% (1992)

57% (1989)

63% (1985)