Frequencies for first 10,000 rows of pct012n179 variable in sf12010880us33 dataset :

   72 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,798       97.98       97.98
          1 |        149        1.49       99.47
          2 |         29        0.29       99.76
          3 |          8        0.08       99.84
          4 |          5        0.05       99.89
          5 |          2        0.02       99.91
          6 |          2        0.02       99.93
          7 |          1        0.01       99.94
         10 |          2        0.02       99.96
         12 |          2        0.02       99.98
         13 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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