Frequencies for first 10,000 rows of pct012m143 variable in sf12010880us32 dataset :

   36 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,842       98.42       98.42
          1 |        141        1.41       99.83
          2 |         16        0.16       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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