Frequencies for first 10,000 rows of pct012m031 variable in sf12010880us32 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,811       98.11       98.11
          1 |        162        1.62       99.73
          2 |         23        0.23       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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