Frequencies for first 10,000 rows of pct012k037 variable in sf12010860us30 dataset :

   34 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,998       89.98       89.98
          1 |        748        7.48       97.46
          2 |        159        1.59       99.05
          3 |         47        0.47       99.52
          4 |         23        0.23       99.75
          5 |          8        0.08       99.83
          6 |          1        0.01       99.84
          8 |          3        0.03       99.87
          9 |          1        0.01       99.88
         10 |          1        0.01       99.89
         11 |          1        0.01       99.90
         19 |          1        0.01       99.91
         21 |          1        0.01       99.92
         25 |          1        0.01       99.93
         31 |          1        0.01       99.94
         32 |          1        0.01       99.95
         36 |          1        0.01       99.96
         45 |          1        0.01       99.97
         49 |          1        0.01       99.98
         60 |          1        0.01       99.99
         64 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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