Frequencies for first 10,000 rows of pct012o099 variable in sf12000860us30 dataset :

   96 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,968       99.68       99.68
          1 |         28        0.28       99.96
          2 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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