Frequencies for first 10,000 rows of pct012e054 variable in sf12000860us20 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,833       98.33       98.33
          1 |        159        1.59       99.92
          2 |          7        0.07       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017