Frequencies for first 10,000 rows of pct012n201 variable in sf12010880us33 dataset :

   94 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,983       99.83       99.83
          1 |         12        0.12       99.95
          2 |          4        0.04       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017