78% (1967)

71% (1970)

71% (1970)

51% (1975)

63% (1967)

71% (1971)

57% (1967)

61% (1976)

63% (1966)

63% (1969)

53% (1966)

53% (1967)

32% (1967)

48% (1967)

53% (1970)

63% (1965)

61% (1968)

56% (1965)

58% (1966)

56% (1964)