Frequencies for first 10,000 rows of pct012k190 variable in sf12010860us30 dataset :

   83 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,752       97.52       97.52
          1 |        214        2.14       99.66
          2 |         20        0.20       99.86
          3 |          5        0.05       99.91
          5 |          1        0.01       99.92
          6 |          1        0.01       99.93
          7 |          2        0.02       99.95
          9 |          1        0.01       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         15 |          1        0.01       99.99
         16 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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