Frequencies for first 10,000 rows of pct012k191 variable in sf12010860us30 dataset :

   84 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,792       97.92       97.92
          1 |        186        1.86       99.78
          2 |         12        0.12       99.90
          3 |          3        0.03       99.93
          4 |          2        0.02       99.95
          5 |          1        0.01       99.96
          6 |          1        0.01       99.97
          7 |          1        0.01       99.98
          8 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017