Frequencies for first 10,000 rows of pct012k049 variable in sf12010880us30 dataset :

   46 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,006       90.06       90.06
          1 |        757        7.57       97.63
          2 |        161        1.61       99.24
          3 |         41        0.41       99.65
          4 |         16        0.16       99.81
          5 |         10        0.10       99.91
          6 |          4        0.04       99.95
          7 |          1        0.01       99.96
          8 |          1        0.01       99.97
          9 |          1        0.01       99.98
         11 |          1        0.01       99.99
         22 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017