Frequencies for first 10,000 rows of pct012k143 variable in sf12010880us30 dataset :

   36 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,284       92.84       92.84
          1 |        556        5.56       98.40
          2 |        109        1.09       99.49
          3 |         31        0.31       99.80
          4 |         10        0.10       99.90
          5 |          5        0.05       99.95
          6 |          3        0.03       99.98
          7 |          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