Frequencies for first 10,000 rows of pct012k196 variable in sf12000860us26 dataset :

   89 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,892       98.92       98.92
          1 |        101        1.01       99.93
          2 |          4        0.04       99.97
          3 |          2        0.02       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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