Frequencies for first 10,000 rows of pct012e142 variable in sf12000860us20 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,713       97.13       97.13
          1 |        256        2.56       99.69
          2 |         24        0.24       99.93
          3 |          5        0.05       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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