70% (1977)

70% (1969)

64% (1973)

66% (1976)

60% (1974)

58% (1975)

59% (1972)

58% (1969)

68% (1976)

55% (1969)

49% (1976)

66% (1970)

50% (1969)

50% (1970)

48% (1975)

55% (1972)

65% (1970)

47% (1974)

64% (1969)

48% (1970)