Frequencies for first 10,000 rows of pct012k036 variable in sf12010860us30 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,995       89.95       89.95
          1 |        754        7.54       97.49
          2 |        156        1.56       99.05
          3 |         48        0.48       99.53
          4 |         16        0.16       99.69
          5 |          9        0.09       99.78
          6 |          5        0.05       99.83
          7 |          1        0.01       99.84
          8 |          2        0.02       99.86
          9 |          1        0.01       99.87
         10 |          1        0.01       99.88
         11 |          1        0.01       99.89
         12 |          1        0.01       99.90
         16 |          1        0.01       99.91
         17 |          1        0.01       99.92
         18 |          1        0.01       99.93
         32 |          1        0.01       99.94
         35 |          1        0.01       99.95
         36 |          1        0.01       99.96
         44 |          1        0.01       99.97
         50 |          1        0.01       99.98
         56 |          1        0.01       99.99
         85 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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