Frequencies for first 10,000 rows of pct012e038 variable in sf12000860us20 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,673       96.73       96.73
          1 |        294        2.94       99.67
          2 |         28        0.28       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 , 18 Apr 2017