Frequencies for first 10,000 rows of pct012k149 variable in sf12010860us30 dataset :

   42 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,790       87.90       87.90
          1 |        864        8.64       96.54
          2 |        206        2.06       98.60
          3 |         72        0.72       99.32
          4 |         30        0.30       99.62
          5 |          9        0.09       99.71
          6 |          7        0.07       99.78
          7 |          3        0.03       99.81
          8 |          3        0.03       99.84
          9 |          1        0.01       99.85
         10 |          2        0.02       99.87
         11 |          1        0.01       99.88
         12 |          1        0.01       99.89
         13 |          1        0.01       99.90
         18 |          1        0.01       99.91
         20 |          1        0.01       99.92
         25 |          1        0.01       99.93
         27 |          1        0.01       99.94
         29 |          1        0.01       99.95
         40 |          1        0.01       99.96
         45 |          1        0.01       99.97
         56 |          1        0.01       99.98
         60 |          1        0.01       99.99
         76 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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