Frequencies for first 10,000 rows of pct012k196 variable in sf12010860us30 dataset :

   89 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,870       98.70       98.70
          1 |        113        1.13       99.83
          2 |          9        0.09       99.92
          3 |          2        0.02       99.94
          4 |          4        0.04       99.98
          5 |          1        0.01       99.99
          7 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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