Frequencies for first 10,000 rows of pct012k138 variable in sf12010860us30 dataset :

   31 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,997       89.97       89.97
          1 |        710        7.10       97.07
          2 |        182        1.82       98.89
          3 |         58        0.58       99.47
          4 |         21        0.21       99.68
          5 |          9        0.09       99.77
          6 |          4        0.04       99.81
          8 |          4        0.04       99.85
          9 |          3        0.03       99.88
         11 |          2        0.02       99.90
         13 |          1        0.01       99.91
         17 |          1        0.01       99.92
         24 |          1        0.01       99.93
         30 |          1        0.01       99.94
         33 |          2        0.02       99.96
         43 |          1        0.01       99.97
         55 |          1        0.01       99.98
         65 |          1        0.01       99.99
         80 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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