Frequencies for first 10,000 rows of pct012c070 variable in sf12000860us18 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,497       94.97       94.97
          1 |        422        4.22       99.19
          2 |         47        0.47       99.66
          3 |         17        0.17       99.83
          4 |          7        0.07       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