Frequencies for first 10,000 rows of pct012n022 variable in sf12010860us33 dataset :

   19 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,790       87.90       87.90
          1 |        784        7.84       95.74
          2 |        203        2.03       97.77
          3 |         81        0.81       98.58
          4 |         40        0.40       98.98
          5 |         36        0.36       99.34
          6 |         12        0.12       99.46
          7 |         12        0.12       99.58
          8 |          5        0.05       99.63
          9 |          7        0.07       99.70
         10 |          4        0.04       99.74
         11 |          4        0.04       99.78
         12 |          3        0.03       99.81
         13 |          3        0.03       99.84
         14 |          1        0.01       99.85
         15 |          2        0.02       99.87
         17 |          1        0.01       99.88
         19 |          2        0.02       99.90
         20 |          1        0.01       99.91
         21 |          1        0.01       99.92
         22 |          3        0.03       99.95
         27 |          2        0.02       99.97
         38 |          1        0.01       99.98
         53 |          1        0.01       99.99
         54 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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