Frequencies for first 10,000 rows of pct012k186 variable in sf12010860us30 dataset :

   79 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,670       96.70       96.70
          1 |        278        2.78       99.48
          2 |         32        0.32       99.80
          3 |          6        0.06       99.86
          4 |          2        0.02       99.88
          5 |          3        0.03       99.91
          6 |          2        0.02       99.93
          9 |          1        0.01       99.94
         10 |          3        0.03       99.97
         11 |          1        0.01       99.98
         16 |          1        0.01       99.99
         22 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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