Frequencies for first 10,000 rows of pct012k146 variable in sf12010880us30 dataset :

   39 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,178       91.78       91.78
          1 |        615        6.15       97.93
          2 |        139        1.39       99.32
          3 |         48        0.48       99.80
          4 |         10        0.10       99.90
          5 |          5        0.05       99.95
          6 |          1        0.01       99.96
          7 |          1        0.01       99.97
         10 |          1        0.01       99.98
         13 |          1        0.01       99.99
         25 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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