66% (1974)

53% (1973)

57% (1976)

59% (1973)

52% (1972)

0% (1976)

54% (1974)

55% (1974)

66% (1973)

60% (1975)

60% (1973)

52% (1976)

32% (1978)

57% (1974)

68% (1976)

55% (1972)

64% (1973)

68% (1972)

33% (1977)

72% (1976)