Frequencies for first 10,000 rows of pct012k064 variable in sf12010880us30 dataset :

   61 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,340       93.40       93.40
          1 |        553        5.53       98.93
          2 |         75        0.75       99.68
          3 |         18        0.18       99.86
          4 |          9        0.09       99.95
          5 |          4        0.04       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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