Frequencies for first 10,000 rows of pct012k050 variable in sf12010880us30 dataset :

   47 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,042       90.42       90.42
          1 |        718        7.18       97.60
          2 |        162        1.62       99.22
          3 |         50        0.50       99.72
          4 |         12        0.12       99.84
          5 |         11        0.11       99.95
          7 |          1        0.01       99.96
          8 |          1        0.01       99.97
          9 |          1        0.01       99.98
         16 |          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