Frequencies for first 10,000 rows of pct012k076 variable in sf12010880us30 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,725       97.25       97.25
          1 |        244        2.44       99.69
          2 |         22        0.22       99.91
          3 |          4        0.04       99.95
          4 |          3        0.03       99.98
          5 |          1        0.01       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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