Frequencies for first 10,000 rows of pct012c187 variable in sf12000860us18 dataset :

   80 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,695       96.95       96.95
          1 |        262        2.62       99.57
          2 |         25        0.25       99.82
          3 |          8        0.08       99.90
          4 |          1        0.01       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