Frequencies for first 10,000 rows of pct012e055 variable in sf12010860us24 dataset :

   52 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,792       97.92       97.92
          1 |        189        1.89       99.81
          2 |         16        0.16       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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