Frequencies for first 10,000 rows of pct012c173 variable in sf12010860us22 dataset :

   66 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,094       90.94       90.94
          1 |        694        6.94       97.88
          2 |        135        1.35       99.23
          3 |         41        0.41       99.64
          4 |         10        0.10       99.74
          5 |          9        0.09       99.83
          6 |          3        0.03       99.86
          7 |          1        0.01       99.87
          9 |          1        0.01       99.88
         11 |          1        0.01       99.89
         12 |          1        0.01       99.90
         13 |          1        0.01       99.91
         14 |          1        0.01       99.92
         17 |          1        0.01       99.93
         20 |          2        0.02       99.95
         23 |          2        0.02       99.97
         25 |          1        0.01       99.98
         37 |          1        0.01       99.99
         38 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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