Frequencies for first 10,000 rows of pct012c015 variable in sf12000860us18 dataset :

   12 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,546       85.46       85.46
          1 |        986        9.86       95.32
          2 |        254        2.54       97.86
          3 |         83        0.83       98.69
          4 |         40        0.40       99.09
          5 |         25        0.25       99.34
          6 |         13        0.13       99.47
          7 |         11        0.11       99.58
          8 |          8        0.08       99.66
          9 |         10        0.10       99.76
         10 |          3        0.03       99.79
         11 |          2        0.02       99.81
         12 |          3        0.03       99.84
         13 |          3        0.03       99.87
         15 |          1        0.01       99.88
         16 |          2        0.02       99.90
         22 |          1        0.01       99.91
         25 |          1        0.01       99.92
         27 |          1        0.01       99.93
         30 |          1        0.01       99.94
         39 |          1        0.01       99.95
         46 |          1        0.01       99.96
         54 |          1        0.01       99.97
         71 |          1        0.01       99.98
         82 |          1        0.01       99.99
         87 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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