Frequencies for first 10,000 rows of pct012c188 variable in sf12010860us22 dataset :

   81 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,626       96.26       96.26
          1 |        313        3.13       99.39
          2 |         36        0.36       99.75
          3 |         12        0.12       99.87
          4 |          3        0.03       99.90
          5 |          3        0.03       99.93
          6 |          1        0.01       99.94
          7 |          2        0.02       99.96
          9 |          1        0.01       99.97
         10 |          2        0.02       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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