Frequencies for first 10,000 rows of pct012k200 variable in sf12010860us30 dataset :

   93 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,927       99.27       99.27
          1 |         68        0.68       99.95
          2 |          3        0.03       99.98
          6 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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