Frequencies for first 10,000 rows of pct012n138 variable in sf12000860us29 dataset :

   31 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,244       92.44       92.44
          1 |        472        4.72       97.16
          2 |        141        1.41       98.57
          3 |         56        0.56       99.13
          4 |         20        0.20       99.33
          5 |         15        0.15       99.48
          6 |          9        0.09       99.57
          7 |          9        0.09       99.66
          8 |          9        0.09       99.75
          9 |          5        0.05       99.80
         10 |          1        0.01       99.81
         12 |          2        0.02       99.83
         13 |          2        0.02       99.85
         14 |          2        0.02       99.87
         15 |          3        0.03       99.90
         16 |          1        0.01       99.91
         20 |          2        0.02       99.93
         21 |          1        0.01       99.94
         23 |          1        0.01       99.95
         25 |          1        0.01       99.96
         26 |          1        0.01       99.97
         35 |          1        0.01       99.98
         38 |          1        0.01       99.99
         49 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017