Frequencies for first 10,000 rows of pct012n128 variable in sf12010880us33 dataset :

   21 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,095       90.95       90.95
          1 |        556        5.56       96.51
          2 |        157        1.57       98.08
          3 |         72        0.72       98.80
          4 |         34        0.34       99.14
          5 |         22        0.22       99.36
          6 |         11        0.11       99.47
          7 |         13        0.13       99.60
          8 |          6        0.06       99.66
          9 |          4        0.04       99.70
         10 |          1        0.01       99.71
         11 |          3        0.03       99.74
         12 |          4        0.04       99.78
         13 |          2        0.02       99.80
         14 |          3        0.03       99.83
         15 |          2        0.02       99.85
         16 |          1        0.01       99.86
         17 |          2        0.02       99.88
         18 |          1        0.01       99.89
         19 |          1        0.01       99.90
         20 |          1        0.01       99.91
         21 |          2        0.02       99.93
         23 |          1        0.01       99.94
         27 |          1        0.01       99.95
         33 |          2        0.02       99.97
         34 |          1        0.01       99.98
         45 |          1        0.01       99.99
         56 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017