Frequencies for first 10,000 rows of pct012e045 variable in sf12000860us20 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,726       97.26       97.26
          1 |        252        2.52       99.78
          2 |         20        0.20       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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