Frequencies for first 10,000 rows of pct012k083 variable in sf12010880us30 dataset :

   80 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,822       98.22       98.22
          1 |        167        1.67       99.89
          2 |          9        0.09       99.98
          3 |          1        0.01       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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