Frequencies for first 10,000 rows of pct012k034 variable in sf12010860us30 dataset :

   31 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,977       89.77       89.77
          1 |        746        7.46       97.23
          2 |        170        1.70       98.93
          3 |         60        0.60       99.53
          4 |         15        0.15       99.68
          5 |          9        0.09       99.77
          6 |          6        0.06       99.83
          7 |          1        0.01       99.84
          8 |          3        0.03       99.87
          9 |          1        0.01       99.88
         10 |          1        0.01       99.89
         12 |          1        0.01       99.90
         17 |          2        0.02       99.92
         22 |          1        0.01       99.93
         25 |          1        0.01       99.94
         29 |          1        0.01       99.95
         37 |          1        0.01       99.96
         38 |          1        0.01       99.97
         50 |          1        0.01       99.98
         55 |          1        0.01       99.99
         68 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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