Frequencies for first 10,000 rows of pct012o090 variable in sf12010860us34 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,683       96.83       96.83
          1 |        285        2.85       99.68
          2 |         27        0.27       99.95
          3 |          4        0.04       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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