Frequencies for first 10,000 rows of pct012e147 variable in sf12010860us24 dataset :

   40 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,699       96.99       96.99
          1 |        267        2.67       99.66
          2 |         28        0.28       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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