Frequencies for first 10,000 rows of pct013c021 variable in sf12010880us35 dataset :

   67 to 69 |
      years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,659       86.59       86.59
          1 |        957        9.57       96.16
          2 |        210        2.10       98.26
          3 |         84        0.84       99.10
          4 |         34        0.34       99.44
          5 |         22        0.22       99.66
          6 |         10        0.10       99.76
          7 |         10        0.10       99.86
          8 |          4        0.04       99.90
         10 |          5        0.05       99.95
         12 |          2        0.02       99.97
         14 |          1        0.01       99.98
         24 |          1        0.01       99.99
         31 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017