Frequencies for first 10,000 rows of pct012k135 variable in sf12010880us30 dataset :

   28 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,282       92.82       92.82
          1 |        551        5.51       98.33
          2 |        119        1.19       99.52
          3 |         24        0.24       99.76
          4 |         16        0.16       99.92
          5 |          2        0.02       99.94
          6 |          3        0.03       99.97
          7 |          1        0.01       99.98
          9 |          1        0.01       99.99
         19 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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