Frequencies for first 10,000 rows of pct012k161 variable in sf12010880us30 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,027       90.27       90.27
          1 |        752        7.52       97.79
          2 |        150        1.50       99.29
          3 |         47        0.47       99.76
          4 |         10        0.10       99.86
          5 |          5        0.05       99.91
          6 |          3        0.03       99.94
          8 |          4        0.04       99.98
         10 |          1        0.01       99.99
         23 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017