Frequencies for first 10,000 rows of pct012n072 variable in sf12010880us33 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,788       97.88       97.88
          1 |        172        1.72       99.60
          2 |         18        0.18       99.78
          3 |          9        0.09       99.87
          4 |          3        0.03       99.90
          5 |          2        0.02       99.92
          6 |          3        0.03       99.95
          7 |          1        0.01       99.96
          9 |          1        0.01       99.97
         10 |          1        0.01       99.98
         12 |          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