Frequencies for first 10,000 rows of pct012e144 variable in sf12000860us20 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,711       97.11       97.11
          1 |        256        2.56       99.67
          2 |         28        0.28       99.95
          3 |          2        0.02       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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