Frequencies for first 10,000 rows of pct012o188 variable in sf12000860us30 dataset :

   81 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,130       91.30       91.30
          1 |        653        6.53       97.83
          2 |        147        1.47       99.30
          3 |         37        0.37       99.67
          4 |         13        0.13       99.80
          5 |         13        0.13       99.93
          6 |          4        0.04       99.97
          7 |          2        0.02       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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