Frequencies for first 10,000 rows of pct012e157 variable in sf12010860us24 dataset :

   50 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,740       97.40       97.40
          1 |        231        2.31       99.71
          2 |         27        0.27       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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