Frequencies for first 10,000 rows of pct012e155 variable in sf12000860us20 dataset :

   48 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,780       97.80       97.80
          1 |        207        2.07       99.87
          2 |         10        0.10       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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