Frequencies for first 10,000 rows of pct012c057 variable in sf12010860us22 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,433       84.33       84.33
          1 |      1,090       10.90       95.23
          2 |        256        2.56       97.79
          3 |        115        1.15       98.94
          4 |         46        0.46       99.40
          5 |         21        0.21       99.61
          6 |          9        0.09       99.70
          7 |          8        0.08       99.78
          8 |          3        0.03       99.81
          9 |          3        0.03       99.84
         10 |          2        0.02       99.86
         11 |          1        0.01       99.87
         13 |          1        0.01       99.88
         14 |          1        0.01       99.89
         15 |          1        0.01       99.90
         16 |          2        0.02       99.92
         21 |          1        0.01       99.93
         22 |          1        0.01       99.94
         25 |          1        0.01       99.95
         26 |          1        0.01       99.96
         42 |          1        0.01       99.97
         44 |          1        0.01       99.98
         49 |          1        0.01       99.99
         74 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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