61% (1971)

70% (1968)

58% (1968)

53% (1976)

46% (1986)

69% (1963)

43% (1973)

40% (1967)

63% (1972)

53% (1973)

48% (1966)

59% (1973)

58% (1976)

63% (1970)

48% (1968)

35% (1972)

48% (1968)

53% (1971)

55% (1970)

60% (1966)