Frequencies for first 10,000 rows of pct012m139 variable in sf12000860us28 dataset :

   32 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,774       97.74       97.74
          1 |        204        2.04       99.78
          2 |         19        0.19       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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