Frequencies for first 10,000 rows of pct012k020 variable in sf12010880us30 dataset :

   17 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,090       90.90       90.90
          1 |        683        6.83       97.73
          2 |        158        1.58       99.31
          3 |         39        0.39       99.70
          4 |         12        0.12       99.82
          5 |          8        0.08       99.90
          6 |          2        0.02       99.92
          7 |          4        0.04       99.96
          8 |          2        0.02       99.98
         12 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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