Frequencies for first 10,000 rows of pct012k198 variable in sf12000860us26 dataset :

   91 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,940       99.40       99.40
          1 |         51        0.51       99.91
          2 |          6        0.06       99.97
          3 |          1        0.01       99.98
          4 |          1        0.01       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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