Frequencies for first 10,000 rows of pct012m137 variable in sf12010880us32 dataset :

   30 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,798       97.98       97.98
          1 |        176        1.76       99.74
          2 |         24        0.24       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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