56% (1992)

64% (1980)

54% (1988)

52% (1972)

54% (1981)

46% (1986)

55% (1987)

66% (1972)

53% (1980)

47% (1978)

54% (1986)

57% (1983)

52% (1985)

61% (1972)

60% (1984)

54% (1984)

66% (1979)

38% (1985)

66% (1984)

72% (1985)