Frequencies for first 10,000 rows of pct012e128 variable in sf12000860us20 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,673       96.73       96.73
          1 |        270        2.70       99.43
          2 |         43        0.43       99.86
          3 |         10        0.10       99.96
          4 |          2        0.02       99.98
          5 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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