53% (1976)

46% (1986)

69% (1963)

63% (1972)

70% (1968)

48% (1966)

43% (1973)

61% (1971)

63% (1970)

53% (1971)

59% (1973)

58% (1976)

53% (1973)

48% (1968)

47% (1972)

48% (1968)

60% (1974)

0% (1972)

59% (1970)

0% (1967)