Frequencies for first 10,000 rows of pct012k123 variable in sf12010880us30 dataset :

   16 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,123       91.23       91.23
          1 |        651        6.51       97.74
          2 |        146        1.46       99.20
          3 |         53        0.53       99.73
          4 |          9        0.09       99.82
          5 |          9        0.09       99.91
          6 |          2        0.02       99.93
          7 |          1        0.01       99.94
          8 |          1        0.01       99.95
          9 |          1        0.01       99.96
         11 |          1        0.01       99.97
         12 |          1        0.01       99.98
         13 |          1        0.01       99.99
         23 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 May 2017