Frequencies for first 10,000 rows of pct012e142 variable in sf12010880us24 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,790       97.90       97.90
          1 |        179        1.79       99.69
          2 |         26        0.26       99.95
          3 |          4        0.04       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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