Frequencies for first 10,000 rows of pct012k187 variable in sf12000860us26 dataset :

   80 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,734       97.34       97.34
          1 |        231        2.31       99.65
          2 |         19        0.19       99.84
          3 |          7        0.07       99.91
          5 |          2        0.02       99.93
          6 |          1        0.01       99.94
          7 |          1        0.01       99.95
          8 |          2        0.02       99.97
         10 |          1        0.01       99.98
         11 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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