Frequencies for first 10,000 rows of pct012k163 variable in sf12010860us30 dataset :

   56 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,781       87.81       87.81
          1 |        910        9.10       96.91
          2 |        212        2.12       99.03
          3 |         56        0.56       99.59
          4 |         15        0.15       99.74
          5 |          6        0.06       99.80
          6 |          3        0.03       99.83
          9 |          2        0.02       99.85
         10 |          2        0.02       99.87
         11 |          2        0.02       99.89
         12 |          1        0.01       99.90
         13 |          1        0.01       99.91
         21 |          1        0.01       99.92
         29 |          1        0.01       99.93
         30 |          1        0.01       99.94
         36 |          1        0.01       99.95
         37 |          2        0.02       99.97
         65 |          1        0.01       99.98
         72 |          1        0.01       99.99
         80 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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