Frequencies for first 10,000 rows of pct012e196 variable in sf12010880us24 dataset :

   89 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,987       99.87       99.87
          1 |         11        0.11       99.98
          2 |          1        0.01       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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