Frequencies for first 10,000 rows of pct012c031 variable in sf12010860us22 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,418       84.18       84.18
          1 |        967        9.67       93.85
          2 |        303        3.03       96.88
          3 |        125        1.25       98.13
          4 |         61        0.61       98.74
          5 |         43        0.43       99.17
          6 |         22        0.22       99.39
          7 |          9        0.09       99.48
          8 |         12        0.12       99.60
          9 |         13        0.13       99.73
         10 |          6        0.06       99.79
         11 |          3        0.03       99.82
         12 |          2        0.02       99.84
         13 |          2        0.02       99.86
         14 |          3        0.03       99.89
         15 |          1        0.01       99.90
         20 |          1        0.01       99.91
         24 |          1        0.01       99.92
         26 |          2        0.02       99.94
         34 |          1        0.01       99.95
         37 |          1        0.01       99.96
         41 |          1        0.01       99.97
         42 |          1        0.01       99.98
         49 |          1        0.01       99.99
         64 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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