Frequencies for first 10,000 rows of pct012f100 variable in sf12000860us21 dataset :

   97 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,957       99.57       99.57
          1 |         37        0.37       99.94
          2 |          5        0.05       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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