Frequencies for first 10,000 rows of pct012k177 variable in sf12000860us26 dataset :

   70 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,602       96.02       96.02
          1 |        327        3.27       99.29
          2 |         40        0.40       99.69
          3 |          9        0.09       99.78
          4 |          8        0.08       99.86
          5 |          4        0.04       99.90
          6 |          2        0.02       99.92
          7 |          2        0.02       99.94
          8 |          2        0.02       99.96
         14 |          1        0.01       99.97
         19 |          1        0.01       99.98
         25 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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