Frequencies for first 10,000 rows of pct012c087 variable in sf12000860us18 dataset :

   84 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,907       99.07       99.07
          1 |         79        0.79       99.86
          2 |         12        0.12       99.98
          3 |          1        0.01       99.99
         10 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017