Frequencies for first 10,000 rows of pct012n034 variable in sf12000860us29 dataset :

   31 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,290       92.90       92.90
          1 |        458        4.58       97.48
          2 |        123        1.23       98.71
          3 |         45        0.45       99.16
          4 |         23        0.23       99.39
          5 |         11        0.11       99.50
          6 |          9        0.09       99.59
          7 |          5        0.05       99.64
          8 |          6        0.06       99.70
          9 |          8        0.08       99.78
         10 |          3        0.03       99.81
         11 |          3        0.03       99.84
         12 |          2        0.02       99.86
         13 |          2        0.02       99.88
         14 |          1        0.01       99.89
         15 |          1        0.01       99.90
         17 |          4        0.04       99.94
         20 |          1        0.01       99.95
         22 |          1        0.01       99.96
         30 |          1        0.01       99.97
         31 |          1        0.01       99.98
         41 |          1        0.01       99.99
         48 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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