Frequencies for first 10,000 rows of pct012k090 variable in sf12010860us30 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,917       99.17       99.17
          1 |         76        0.76       99.93
          2 |          4        0.04       99.97
          3 |          2        0.02       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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