Frequencies for first 10,000 rows of pct012k132 variable in sf12010860us30 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,940       89.40       89.40
          1 |        766        7.66       97.06
          2 |        162        1.62       98.68
          3 |         64        0.64       99.32
          4 |         31        0.31       99.63
          5 |         11        0.11       99.74
          6 |          7        0.07       99.81
          7 |          2        0.02       99.83
          8 |          3        0.03       99.86
         10 |          2        0.02       99.88
         14 |          2        0.02       99.90
         16 |          1        0.01       99.91
         21 |          3        0.03       99.94
         38 |          1        0.01       99.95
         39 |          1        0.01       99.96
         56 |          1        0.01       99.97
         57 |          1        0.01       99.98
         71 |          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