Frequencies for first 10,000 rows of pct012m036 variable in sf12000860us28 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,791       97.91       97.91
          1 |        191        1.91       99.82
          2 |         16        0.16       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017