Frequencies for first 10,000 rows of pct012c149 variable in sf12010860us22 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,404       84.04       84.04
          1 |      1,019       10.19       94.23
          2 |        294        2.94       97.17
          3 |        126        1.26       98.43
          4 |         70        0.70       99.13
          5 |         31        0.31       99.44
          6 |         14        0.14       99.58
          7 |         10        0.10       99.68
          8 |          8        0.08       99.76
          9 |          5        0.05       99.81
         10 |          2        0.02       99.83
         11 |          3        0.03       99.86
         12 |          1        0.01       99.87
         13 |          2        0.02       99.89
         14 |          1        0.01       99.90
         18 |          1        0.01       99.91
         20 |          1        0.01       99.92
         25 |          1        0.01       99.93
         27 |          1        0.01       99.94
         29 |          1        0.01       99.95
         40 |          1        0.01       99.96
         45 |          1        0.01       99.97
         56 |          1        0.01       99.98
         60 |          1        0.01       99.99
         78 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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