Frequencies for first 10,000 rows of pct012k075 variable in sf12010860us30 dataset :

   72 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,558       95.58       95.58
          1 |        360        3.60       99.18
          2 |         51        0.51       99.69
          3 |         16        0.16       99.85
          4 |          2        0.02       99.87
          5 |          2        0.02       99.89
          6 |          1        0.01       99.90
          7 |          2        0.02       99.92
          8 |          1        0.01       99.93
         11 |          1        0.01       99.94
         12 |          1        0.01       99.95
         13 |          1        0.01       99.96
         14 |          1        0.01       99.97
         23 |          1        0.01       99.98
         25 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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