Frequencies for first 10,000 rows of pct012e066 variable in sf12010860us24 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,873       98.73       98.73
          1 |        119        1.19       99.92
          2 |          7        0.07       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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