Frequencies for first 10,000 rows of pct012f098 variable in sf12000860us21 dataset :

   95 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,926       99.26       99.26
          1 |         71        0.71       99.97
          2 |          1        0.01       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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