Frequencies for first 10,000 rows of pct012n037 variable in sf12000860us29 dataset :

   34 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,246       92.46       92.46
          1 |        494        4.94       97.40
          2 |        111        1.11       98.51
          3 |         46        0.46       98.97
          4 |         37        0.37       99.34
          5 |         15        0.15       99.49
          6 |          9        0.09       99.58
          7 |          6        0.06       99.64
          8 |          7        0.07       99.71
          9 |          2        0.02       99.73
         10 |          1        0.01       99.74
         11 |          7        0.07       99.81
         12 |          5        0.05       99.86
         13 |          1        0.01       99.87
         14 |          2        0.02       99.89
         15 |          2        0.02       99.91
         16 |          1        0.01       99.92
         17 |          1        0.01       99.93
         18 |          1        0.01       99.94
         20 |          1        0.01       99.95
         21 |          2        0.02       99.97
         23 |          1        0.01       99.98
         28 |          1        0.01       99.99
         32 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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