Frequencies for first 10,000 rows of pct012o174 variable in sf12000860us30 dataset :

   67 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,592       85.92       85.92
          1 |        953        9.53       95.45
          2 |        246        2.46       97.91
          3 |         91        0.91       98.82
          4 |         47        0.47       99.29
          5 |         18        0.18       99.47
          6 |         18        0.18       99.65
          7 |         12        0.12       99.77
          8 |          7        0.07       99.84
          9 |          8        0.08       99.92
         10 |          2        0.02       99.94
         11 |          4        0.04       99.98
         12 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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