Frequencies for first 10,000 rows of pct012k078 variable in sf12010880us30 dataset :

   75 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,754       97.54       97.54
          1 |        226        2.26       99.80
          2 |         16        0.16       99.96
          3 |          2        0.02       99.98
          4 |          1        0.01       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017