Frequencies for first 10,000 rows of pct012f096 variable in sf12000860us21 dataset :

   93 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,900       99.00       99.00
          1 |         83        0.83       99.83
          2 |         15        0.15       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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