Frequencies for first 10,000 rows of pct012e057 variable in sf12010860us24 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,787       97.87       97.87
          1 |        198        1.98       99.85
          2 |         13        0.13       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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