Frequencies for first 10,000 rows of pct012k055 variable in sf12010860us30 dataset :

   52 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,652       86.52       86.52
          1 |        993        9.93       96.45
          2 |        237        2.37       98.82
          3 |         60        0.60       99.42
          4 |         25        0.25       99.67
          5 |          7        0.07       99.74
          6 |          5        0.05       99.79
          7 |          2        0.02       99.81
          8 |          4        0.04       99.85
          9 |          1        0.01       99.86
         10 |          2        0.02       99.88
         12 |          1        0.01       99.89
         14 |          1        0.01       99.90
         18 |          1        0.01       99.91
         21 |          1        0.01       99.92
         23 |          1        0.01       99.93
         33 |          1        0.01       99.94
         37 |          1        0.01       99.95
         41 |          1        0.01       99.96
         48 |          1        0.01       99.97
         58 |          1        0.01       99.98
         63 |          1        0.01       99.99
         75 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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