Frequencies for first 10,000 rows of pct012e037 variable in sf12000860us20 dataset :

   34 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,692       96.92       96.92
          1 |        271        2.71       99.63
          2 |         31        0.31       99.94
          3 |          3        0.03       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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