Frequencies for first 10,000 rows of pct012n198 variable in sf12010880us33 dataset :

   91 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,960       99.60       99.60
          1 |         36        0.36       99.96
          2 |          1        0.01       99.97
          3 |          1        0.01       99.98
          4 |          1        0.01       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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