67% (1974)

57% (1976)

60% (1975)

53% (1973)

55% (1973)

57% (1974)

66% (1973)

58% (1974)

64% (1973)

55% (1975)

72% (1976)

54% (1974)

35% (1974)

60% (1977)

64% (1974)

69% (1976)

59% (1973)

52% (1972)

66% (1974)

0% (1976)