Frequencies for first 10,000 rows of pct012c074 variable in sf12000860us18 dataset :

   71 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,612       96.12       96.12
          1 |        320        3.20       99.32
          2 |         50        0.50       99.82
          3 |          5        0.05       99.87
          4 |          3        0.03       99.90
          5 |          2        0.02       99.92
          7 |          1        0.01       99.93
          8 |          1        0.01       99.94
         10 |          3        0.03       99.97
         12 |          1        0.01       99.98
         17 |          1        0.01       99.99
         21 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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