Frequencies for first 10,000 rows of pct012n173 variable in sf12010880us33 dataset :

   66 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,701       97.01       97.01
          1 |        212        2.12       99.13
          2 |         57        0.57       99.70
          3 |         11        0.11       99.81
          4 |          2        0.02       99.83
          5 |          4        0.04       99.87
          6 |          3        0.03       99.90
          7 |          4        0.04       99.94
          8 |          2        0.02       99.96
          9 |          1        0.01       99.97
         10 |          2        0.02       99.99
         18 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017