Frequencies for first 10,000 rows of pct012e040 variable in sf12000860us20 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,707       97.07       97.07
          1 |        265        2.65       99.72
          2 |         25        0.25       99.97
          3 |          1        0.01       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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