Frequencies for first 10,000 rows of pct012n140 variable in sf12000860us29 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,232       92.32       92.32
          1 |        505        5.05       97.37
          2 |        117        1.17       98.54
          3 |         56        0.56       99.10
          4 |         23        0.23       99.33
          5 |         17        0.17       99.50
          6 |          5        0.05       99.55
          7 |         11        0.11       99.66
          8 |          7        0.07       99.73
          9 |          2        0.02       99.75
         10 |          4        0.04       99.79
         11 |          4        0.04       99.83
         12 |          4        0.04       99.87
         13 |          2        0.02       99.89
         15 |          1        0.01       99.90
         16 |          1        0.01       99.91
         17 |          1        0.01       99.92
         18 |          1        0.01       99.93
         19 |          2        0.02       99.95
         20 |          1        0.01       99.96
         21 |          1        0.01       99.97
         34 |          1        0.01       99.98
         37 |          1        0.01       99.99
         51 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2017