Frequencies for first 10,000 rows of pct012o180 variable in sf12010860us34 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,681       86.81       86.81
          1 |        947        9.47       96.28
          2 |        249        2.49       98.77
          3 |         82        0.82       99.59
          4 |         24        0.24       99.83
          5 |          8        0.08       99.91
          6 |          6        0.06       99.97
          7 |          2        0.02       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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