Frequencies for first 10,000 rows of pct012m021 variable in sf12010880us32 dataset :

   18 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,854       98.54       98.54
          1 |        127        1.27       99.81
          2 |         15        0.15       99.96
          3 |          2        0.02       99.98
          4 |          1        0.01       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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