Frequencies for first 10,000 rows of pct012k071 variable in sf12000860us26 dataset :

   68 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,607       96.07       96.07
          1 |        337        3.37       99.44
          2 |         35        0.35       99.79
          3 |          5        0.05       99.84
          4 |          4        0.04       99.88
          5 |          2        0.02       99.90
          6 |          3        0.03       99.93
          7 |          2        0.02       99.95
          8 |          1        0.01       99.96
          9 |          2        0.02       99.98
         21 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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