58% (1975)

56% (1976)

55% (1973)

60% (1973)

63% (1974)

30% (1974)

68% (1974)

67% (1974)

57% (1974)

49% (1976)

60% (1973)

55% (1974)

0% (1979)

36% (1973)

0% (1986)

66% (1973)

0% (1976)

64% (1973)

68% (1972)

72% (1976)