53% (1973)

57% (1976)

66% (1974)

68% (1974)

60% (1975)

60% (1973)

72% (1976)

60% (1973)

53% (1976)

55% (1972)

33% (1977)

60% (1974)

64% (1973)

58% (1974)

57% (1974)

0% (1976)

57% (1972)

0% (1979)

55% (1975)

52% (1972)