Frequencies for first 10,000 rows of pct012o170 variable in sf12000860us30 dataset :

   63 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,409       84.09       84.09
          1 |      1,075       10.75       94.84
          2 |        259        2.59       97.43
          3 |        110        1.10       98.53
          4 |         52        0.52       99.05
          5 |         21        0.21       99.26
          6 |         20        0.20       99.46
          7 |         15        0.15       99.61
          8 |         14        0.14       99.75
          9 |          4        0.04       99.79
         10 |          5        0.05       99.84
         11 |          4        0.04       99.88
         12 |          7        0.07       99.95
         13 |          1        0.01       99.96
         14 |          1        0.01       99.97
         16 |          1        0.01       99.98
         21 |          1        0.01       99.99
         28 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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