Frequencies for first 10,000 rows of pct012k140 variable in sf12010880us30 dataset :

   33 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,313       93.13       93.13
          1 |        524        5.24       98.37
          2 |        112        1.12       99.49
          3 |         34        0.34       99.83
          4 |          8        0.08       99.91
          5 |          3        0.03       99.94
          6 |          3        0.03       99.97
          7 |          1        0.01       99.98
          8 |          1        0.01       99.99
         24 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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