Frequencies for first 10,000 rows of pct012c080 variable in sf12000860us18 dataset :

   77 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,759       97.59       97.59
          1 |        196        1.96       99.55
          2 |         29        0.29       99.84
          3 |          6        0.06       99.90
          4 |          4        0.04       99.94
          5 |          3        0.03       99.97
          6 |          1        0.01       99.98
         12 |          1        0.01       99.99
         17 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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