Frequencies for first 10,000 rows of pct012k035 variable in sf12010880us30 dataset :

   32 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,301       93.01       93.01
          1 |        536        5.36       98.37
          2 |        114        1.14       99.51
          3 |         37        0.37       99.88
          4 |          6        0.06       99.94
          5 |          3        0.03       99.97
          7 |          2        0.02       99.99
         21 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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