Frequencies for first 10,000 rows of pct012e160 variable in sf12010880us24 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,819       98.19       98.19
          1 |        160        1.60       99.79
          2 |         19        0.19       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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