Frequencies for first 10,000 rows of pct012e156 variable in sf12000860us20 dataset :

   49 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,835       98.35       98.35
          1 |        155        1.55       99.90
          2 |          7        0.07       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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