Frequencies for first 10,000 rows of pct012m156 variable in sf12010880us32 dataset :

   49 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,832       98.32       98.32
          1 |        155        1.55       99.87
          2 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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