Frequencies for first 10,000 rows of pct012k077 variable in sf12010880us30 dataset :

   74 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,727       97.27       97.27
          1 |        239        2.39       99.66
          2 |         22        0.22       99.88
          3 |          9        0.09       99.97
          4 |          1        0.01       99.98
          5 |          1        0.01       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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