Frequencies for first 10,000 rows of pct012e151 variable in sf12000860us20 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,754       97.54       97.54
          1 |        229        2.29       99.83
          2 |         14        0.14       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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