Frequencies for first 10,000 rows of pct012n087 variable in sf12000860us29 dataset :

   84 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,933       99.33       99.33
          1 |         60        0.60       99.93
          2 |          4        0.04       99.97
          3 |          1        0.01       99.98
          4 |          1        0.01       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017