Frequencies for first 10,000 rows of pct012k081 variable in sf12010880us30 dataset :

   78 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,812       98.12       98.12
          1 |        169        1.69       99.81
          2 |         17        0.17       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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