Frequencies for first 10,000 rows of pct012k063 variable in sf12010880us30 dataset :

   60 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,260       92.60       92.60
          1 |        606        6.06       98.66
          2 |         95        0.95       99.61
          3 |         22        0.22       99.83
          4 |         10        0.10       99.93
          5 |          3        0.03       99.96
          6 |          1        0.01       99.97
          7 |          2        0.02       99.99
         15 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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