Frequencies for first 10,000 rows of pct012k144 variable in sf12010860us30 dataset :

   37 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,932       89.32       89.32
          1 |        777        7.77       97.09
          2 |        189        1.89       98.98
          3 |         49        0.49       99.47
          4 |         25        0.25       99.72
          5 |          6        0.06       99.78
          6 |          5        0.05       99.83
          7 |          1        0.01       99.84
          8 |          1        0.01       99.85
          9 |          1        0.01       99.86
         10 |          2        0.02       99.88
         12 |          1        0.01       99.89
         13 |          1        0.01       99.90
         14 |          1        0.01       99.91
         21 |          1        0.01       99.92
         30 |          1        0.01       99.93
         31 |          1        0.01       99.94
         32 |          1        0.01       99.95
         35 |          1        0.01       99.96
         47 |          1        0.01       99.97
         62 |          1        0.01       99.98
         63 |          1        0.01       99.99
         97 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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