Frequencies for first 10,000 rows of pct012k070 variable in sf12010860us30 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,312       93.12       93.12
          1 |        564        5.64       98.76
          2 |         79        0.79       99.55
          3 |         22        0.22       99.77
          4 |          6        0.06       99.83
          5 |          4        0.04       99.87
          6 |          1        0.01       99.88
          7 |          2        0.02       99.90
          9 |          2        0.02       99.92
         11 |          1        0.01       99.93
         17 |          1        0.01       99.94
         19 |          2        0.02       99.96
         23 |          1        0.01       99.97
         28 |          1        0.01       99.98
         38 |          1        0.01       99.99
         47 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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