Frequencies for first 10,000 rows of pct012k070 variable in sf12000860us26 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,565       95.65       95.65
          1 |        370        3.70       99.35
          2 |         40        0.40       99.75
          3 |         10        0.10       99.85
          4 |          5        0.05       99.90
          5 |          2        0.02       99.92
          7 |          1        0.01       99.93
          9 |          2        0.02       99.95
         11 |          2        0.02       99.97
         12 |          1        0.01       99.98
         20 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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