Frequencies for first 10,000 rows of pct012e161 variable in sf12000860us20 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,866       98.66       98.66
          1 |        128        1.28       99.94
          2 |          5        0.05       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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