Frequencies for first 10,000 rows of pct012k028 variable in sf12010860us30 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,917       89.17       89.17
          1 |        785        7.85       97.02
          2 |        174        1.74       98.76
          3 |         58        0.58       99.34
          4 |         34        0.34       99.68
          5 |          7        0.07       99.75
          6 |          4        0.04       99.79
          7 |          8        0.08       99.87
          8 |          1        0.01       99.88
         10 |          1        0.01       99.89
         15 |          2        0.02       99.91
         17 |          1        0.01       99.92
         19 |          1        0.01       99.93
         23 |          1        0.01       99.94
         33 |          1        0.01       99.95
         37 |          1        0.01       99.96
         41 |          1        0.01       99.97
         50 |          1        0.01       99.98
         56 |          1        0.01       99.99
         57 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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