Frequencies for first 10,000 rows of pct012o077 variable in sf12000860us30 dataset :

   74 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,008       90.08       90.08
          1 |        746        7.46       97.54
          2 |        144        1.44       98.98
          3 |         61        0.61       99.59
          4 |         13        0.13       99.72
          5 |         12        0.12       99.84
          6 |          7        0.07       99.91
          7 |          4        0.04       99.95
          8 |          2        0.02       99.97
          9 |          1        0.01       99.98
         10 |          1        0.01       99.99
         11 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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