Frequencies for first 10,000 rows of pct012m142 variable in sf12000860us28 dataset :

   35 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,786       97.86       97.86
          1 |        193        1.93       99.79
          2 |         18        0.18       99.97
          3 |          2        0.02       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017