Frequencies for first 10,000 rows of pct012k066 variable in sf12010880us30 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,306       93.06       93.06
          1 |        592        5.92       98.98
          2 |         73        0.73       99.71
          3 |         24        0.24       99.95
          4 |          2        0.02       99.97
          5 |          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