Frequencies for first 10,000 rows of pct012o199 variable in sf12000860us30 dataset :

   92 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,760       97.60       97.60
          1 |        217        2.17       99.77
          2 |         16        0.16       99.93
          3 |          6        0.06       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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