Frequencies for first 10,000 rows of pct012e139 variable in sf12000860us20 dataset :

   32 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,719       97.19       97.19
          1 |        247        2.47       99.66
          2 |         29        0.29       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017