40% (1985)

50% (1980)

60% (1986)

60% (1981)

55% (1989)

53% (1986)

53% (1980)

69% (1988)

68% (1988)

62% (1988)

59% (1985)

57% (1988)

66% (1987)

54% (1988)

69% (1987)

61% (1986)

54% (1983)

52% (1983)

56% (1987)

55% (1987)