Frequencies for first 10,000 rows of pct012m028 variable in sf12010880us32 dataset :

   25 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,811       98.11       98.11
          1 |        168        1.68       99.79
          2 |         15        0.15       99.94
          3 |          4        0.04       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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