Frequencies for first 10,000 rows of pct012c092 variable in sf12000860us18 dataset :

   89 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,952       99.52       99.52
          1 |         42        0.42       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