Frequencies for first 10,000 rows of pct012k188 variable in sf12000860us26 dataset :

   81 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,776       97.76       97.76
          1 |        190        1.90       99.66
          2 |         19        0.19       99.85
          3 |          6        0.06       99.91
          4 |          2        0.02       99.93
          5 |          1        0.01       99.94
          6 |          2        0.02       99.96
          7 |          2        0.02       99.98
          9 |          1        0.01       99.99
         20 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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