77% (1976)

80% (1973)

80% (1967)

50% (1968)

57% (1974)

62% (1964)

75% (1978)

49% (1961)

53% (1962)

69% (1973)

46% (1962)

54% (1974)

71% (1969)

41% (1976)

64% (1967)

51% (1963)

59% (1977)

45% (1969)

40% (1973)

45% (1962)