Frequencies for first 10,000 rows of pct012k131 variable in sf12010880us30 dataset :

   24 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,267       92.67       92.67
          1 |        565        5.65       98.32
          2 |        104        1.04       99.36
          3 |         33        0.33       99.69
          4 |         15        0.15       99.84
          5 |         11        0.11       99.95
          6 |          3        0.03       99.98
          9 |          1        0.01       99.99
         17 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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