Frequencies for first 10,000 rows of pct012o075 variable in sf12010860us34 dataset :

   72 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,769       87.69       87.69
          1 |        946        9.46       97.15
          2 |        188        1.88       99.03
          3 |         65        0.65       99.68
          4 |         16        0.16       99.84
          5 |         13        0.13       99.97
          7 |          1        0.01       99.98
          9 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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