Frequencies for first 10,000 rows of pct012e024 variable in sf12010880us24 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,683       96.83       96.83
          1 |        262        2.62       99.45
          2 |         38        0.38       99.83
          3 |         14        0.14       99.97
          4 |          2        0.02       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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