Frequencies for first 10,000 rows of pct012e028 variable in sf12000860us20 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,649       96.49       96.49
          1 |        287        2.87       99.36
          2 |         47        0.47       99.83
          3 |          9        0.09       99.92
          4 |          5        0.05       99.97
          5 |          1        0.01       99.98
          6 |          1        0.01       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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