Frequencies for first 10,000 rows of pct012m056 variable in sf12010880us32 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,872       98.72       98.72
          1 |        119        1.19       99.91
          2 |          7        0.07       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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