Frequencies for first 10,000 rows of pct012o057 variable in sf12000860us30 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,002       80.02       80.02
          1 |      1,150       11.50       91.52
          2 |        410        4.10       95.62
          3 |        174        1.74       97.36
          4 |         96        0.96       98.32
          5 |         52        0.52       98.84
          6 |         25        0.25       99.09
          7 |         18        0.18       99.27
          8 |         20        0.20       99.47
          9 |         10        0.10       99.57
         10 |          9        0.09       99.66
         11 |          6        0.06       99.72
         12 |          2        0.02       99.74
         13 |          3        0.03       99.77
         14 |          7        0.07       99.84
         15 |          5        0.05       99.89
         16 |          1        0.01       99.90
         18 |          2        0.02       99.92
         19 |          1        0.01       99.93
         20 |          1        0.01       99.94
         21 |          3        0.03       99.97
         23 |          1        0.01       99.98
         26 |          1        0.01       99.99
         42 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017