Frequencies for first 10,000 rows of pct012n180 variable in sf12010860us33 dataset :

   73 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,788       97.88       97.88
          1 |        160        1.60       99.48
          2 |         26        0.26       99.74
          3 |         10        0.10       99.84
          4 |          6        0.06       99.90
          5 |          1        0.01       99.91
          6 |          2        0.02       99.93
          8 |          3        0.03       99.96
         10 |          1        0.01       99.97
         11 |          1        0.01       99.98
         12 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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