Frequencies for first 10,000 rows of pct012k082 variable in sf12010860us30 dataset :

   79 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,768       97.68       97.68
          1 |        203        2.03       99.71
          2 |         18        0.18       99.89
          3 |          3        0.03       99.92
          4 |          3        0.03       99.95
          5 |          1        0.01       99.96
          7 |          2        0.02       99.98
         13 |          1        0.01       99.99
         17 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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