Frequencies for first 10,000 rows of pct012k072 variable in sf12010860us30 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,453       94.53       94.53
          1 |        463        4.63       99.16
          2 |         50        0.50       99.66
          3 |         11        0.11       99.77
          4 |          7        0.07       99.84
          5 |          4        0.04       99.88
          6 |          1        0.01       99.89
          7 |          2        0.02       99.91
          8 |          2        0.02       99.93
         11 |          2        0.02       99.95
         12 |          1        0.01       99.96
         15 |          1        0.01       99.97
         27 |          2        0.02       99.99
         44 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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