Frequencies for first 10,000 rows of pct012k056 variable in sf12010880us30 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,096       90.96       90.96
          1 |        723        7.23       98.19
          2 |        127        1.27       99.46
          3 |         31        0.31       99.77
          4 |         11        0.11       99.88
          5 |          7        0.07       99.95
          6 |          2        0.02       99.97
          7 |          2        0.02       99.99
         17 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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