Frequencies for first 10,000 rows of pct012e070 variable in sf12000860us20 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,930       99.30       99.30
          1 |         65        0.65       99.95
          2 |          4        0.04       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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