Frequencies for first 10,000 rows of pct012c047 variable in sf12010860us22 dataset :

   44 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,260       82.60       82.60
          1 |      1,143       11.43       94.03
          2 |        327        3.27       97.30
          3 |        132        1.32       98.62
          4 |         52        0.52       99.14
          5 |         29        0.29       99.43
          6 |         14        0.14       99.57
          7 |         14        0.14       99.71
          8 |         10        0.10       99.81
          9 |          2        0.02       99.83
         10 |          1        0.01       99.84
         11 |          2        0.02       99.86
         12 |          2        0.02       99.88
         13 |          1        0.01       99.89
         14 |          1        0.01       99.90
         16 |          2        0.02       99.92
         19 |          1        0.01       99.93
         30 |          1        0.01       99.94
         31 |          1        0.01       99.95
         34 |          1        0.01       99.96
         37 |          1        0.01       99.97
         53 |          1        0.01       99.98
         76 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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