Frequencies for first 10,000 rows of pct012e135 variable in sf12000860us20 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,704       97.04       97.04
          1 |        253        2.53       99.57
          2 |         36        0.36       99.93
          3 |          6        0.06       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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