Frequencies for first 10,000 rows of pct012f091 variable in sf12000860us21 dataset :

   88 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,758       97.58       97.58
          1 |        168        1.68       99.26
          2 |         51        0.51       99.77
          3 |          9        0.09       99.86
          4 |         10        0.10       99.96
          6 |          3        0.03       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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