Frequencies for first 10,000 rows of pct012c091 variable in sf12000860us18 dataset :

   88 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,934       99.34       99.34
          1 |         62        0.62       99.96
          2 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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