Frequencies for first 10,000 rows of pct012g090 variable in sf12010880us26 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,608       96.08       96.08
          1 |        324        3.24       99.32
          2 |         47        0.47       99.79
          3 |         14        0.14       99.93
          4 |          5        0.05       99.98
          5 |          1        0.01       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017