Frequencies for first 10,000 rows of pct012o080 variable in sf12000860us30 dataset :

   77 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,175       91.75       91.75
          1 |        639        6.39       98.14
          2 |        119        1.19       99.33
          3 |         44        0.44       99.77
          4 |          8        0.08       99.85
          5 |          7        0.07       99.92
          6 |          4        0.04       99.96
          7 |          3        0.03       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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