Frequencies for first 10,000 rows of pct012e036 variable in sf12000860us20 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,722       97.22       97.22
          1 |        248        2.48       99.70
          2 |         24        0.24       99.94
          3 |          2        0.02       99.96
          4 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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