Frequencies for first 10,000 rows of pct012e056 variable in sf12010860us24 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,797       97.97       97.97
          1 |        188        1.88       99.85
          2 |         12        0.12       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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