Frequencies for first 10,000 rows of pct012e039 variable in sf12000860us20 dataset :

   36 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,720       97.20       97.20
          1 |        238        2.38       99.58
          2 |         35        0.35       99.93
          3 |          4        0.04       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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