Frequencies for first 10,000 rows of pct012e020 variable in sf12000860us20 dataset :

   17 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,730       97.30       97.30
          1 |        234        2.34       99.64
          2 |         34        0.34       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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