45% (1972)

65% (1968)

62% (1971)

63% (1971)

55% (1968)

47% (1972)

53% (1968)

59% (1972)

58% (1973)

51% (1971)

59% (1971)

48% (1969)

62% (1967)

49% (1969)

49% (1970)

47% (1970)

40% (1969)

58% (1969)

52% (1972)

10% (1970)