Frequencies for first 10,000 rows of pct012c135 variable in sf12000860us18 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,648       86.48       86.48
          1 |        899        8.99       95.47
          2 |        244        2.44       97.91
          3 |         89        0.89       98.80
          4 |         42        0.42       99.22
          5 |         20        0.20       99.42
          6 |         19        0.19       99.61
          7 |         14        0.14       99.75
          8 |          6        0.06       99.81
          9 |          3        0.03       99.84
         10 |          2        0.02       99.86
         11 |          1        0.01       99.87
         13 |          1        0.01       99.88
         14 |          1        0.01       99.89
         20 |          1        0.01       99.90
         22 |          1        0.01       99.91
         24 |          1        0.01       99.92
         25 |          1        0.01       99.93
         26 |          1        0.01       99.94
         41 |          1        0.01       99.95
         47 |          1        0.01       99.96
         60 |          1        0.01       99.97
         61 |          1        0.01       99.98
         70 |          1        0.01       99.99
         91 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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