Frequencies for first 10,000 rows of pct012k084 variable in sf12010880us30 dataset :

   81 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,860       98.60       98.60
          1 |        130        1.30       99.90
          2 |          9        0.09       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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