Frequencies for first 10,000 rows of pct012e149 variable in sf12000860us20 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,765       97.65       97.65
          1 |        217        2.17       99.82
          2 |         17        0.17       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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