Frequencies for first 10,000 rows of pct012k022 variable in sf12010860us30 dataset :

   19 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,732       87.32       87.32
          1 |        865        8.65       95.97
          2 |        236        2.36       98.33
          3 |         80        0.80       99.13
          4 |         30        0.30       99.43
          5 |         14        0.14       99.57
          6 |         13        0.13       99.70
          7 |          4        0.04       99.74
          8 |          4        0.04       99.78
          9 |          4        0.04       99.82
         10 |          3        0.03       99.85
         12 |          1        0.01       99.86
         13 |          1        0.01       99.87
         14 |          2        0.02       99.89
         15 |          1        0.01       99.90
         19 |          1        0.01       99.91
         23 |          1        0.01       99.92
         30 |          1        0.01       99.93
         40 |          1        0.01       99.94
         41 |          1        0.01       99.95
         48 |          1        0.01       99.96
         52 |          1        0.01       99.97
         65 |          1        0.01       99.98
         71 |          1        0.01       99.99
         97 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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