Frequencies for first 10,000 rows of pct012k042 variable in sf12010860us30 dataset :

   39 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,794       87.94       87.94
          1 |        879        8.79       96.73
          2 |        206        2.06       98.79
          3 |         63        0.63       99.42
          4 |         27        0.27       99.69
          5 |         10        0.10       99.79
          6 |          4        0.04       99.83
          7 |          3        0.03       99.86
          8 |          1        0.01       99.87
          9 |          1        0.01       99.88
         13 |          1        0.01       99.89
         17 |          1        0.01       99.90
         19 |          1        0.01       99.91
         20 |          1        0.01       99.92
         21 |          1        0.01       99.93
         24 |          1        0.01       99.94
         35 |          1        0.01       99.95
         42 |          1        0.01       99.96
         43 |          1        0.01       99.97
         60 |          1        0.01       99.98
         70 |          1        0.01       99.99
         71 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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