Frequencies for first 10,000 rows of pct012c200 variable in sf12000860us18 dataset :

   93 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,942       99.42       99.42
          1 |         55        0.55       99.97
          2 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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