Frequencies for first 10,000 rows of pct012f090 variable in sf12000860us21 dataset :

   87 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,726       97.26       97.26
          1 |        174        1.74       99.00
          2 |         60        0.60       99.60
          3 |         22        0.22       99.82
          4 |          8        0.08       99.90
          5 |          6        0.06       99.96
          6 |          2        0.02       99.98
          7 |          1        0.01       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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