Frequencies for first 10,000 rows of pct012o055 variable in sf12000860us30 dataset :

   52 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,621       76.21       76.21
          1 |      1,349       13.49       89.70
          2 |        437        4.37       94.07
          3 |        233        2.33       96.40
          4 |        119        1.19       97.59
          5 |         75        0.75       98.34
          6 |         44        0.44       98.78
          7 |         29        0.29       99.07
          8 |         18        0.18       99.25
          9 |         18        0.18       99.43
         10 |         12        0.12       99.55
         11 |          6        0.06       99.61
         12 |          7        0.07       99.68
         13 |          9        0.09       99.77
         14 |          4        0.04       99.81
         15 |          2        0.02       99.83
         16 |          5        0.05       99.88
         17 |          2        0.02       99.90
         18 |          1        0.01       99.91
         21 |          1        0.01       99.92
         22 |          1        0.01       99.93
         24 |          2        0.02       99.95
         25 |          2        0.02       99.97
         28 |          1        0.01       99.98
         35 |          1        0.01       99.99
         49 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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