Frequencies for first 10,000 rows of pct012k135 variable in sf12010860us30 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,965       89.65       89.65
          1 |        746        7.46       97.11
          2 |        178        1.78       98.89
          3 |         48        0.48       99.37
          4 |         31        0.31       99.68
          5 |          7        0.07       99.75
          6 |          4        0.04       99.79
          7 |          3        0.03       99.82
          8 |          3        0.03       99.85
          9 |          2        0.02       99.87
         13 |          1        0.01       99.88
         14 |          1        0.01       99.89
         20 |          1        0.01       99.90
         21 |          2        0.02       99.92
         26 |          1        0.01       99.93
         28 |          1        0.01       99.94
         30 |          1        0.01       99.95
         38 |          1        0.01       99.96
         44 |          1        0.01       99.97
         63 |          1        0.01       99.98
         65 |          1        0.01       99.99
         72 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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