Frequencies for first 10,000 rows of pct012f097 variable in sf12000860us21 dataset :

   94 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,926       99.26       99.26
          1 |         68        0.68       99.94
          2 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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