year jinin syotoku sisyutu
1956 4.47 27464 24231
1957 4.44 29810 26092
1958 4.46 31824 27799
1959 4.41 34122 29375
1960 4.38 37708 32093
1961 4.22 41807 34896
1962 4.17 46930 39339
1963 4.17 52116 43927
1964 4.13 58104 48324
1965 4.11 62340 51859
1966 4.05 68468 56515
1967 4.01 75429 61918
1968 3.94 82601 67402
1969 3.86 92406 74760