Frequencies for first 10,000 rows of pct012e049 variable in sf12010880us24 dataset :

   46 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,800       98.00       98.00
          1 |        182        1.82       99.82
          2 |         16        0.16       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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