Frequencies for first 10,000 rows of pct012k160 variable in sf12010880us30 dataset :

   53 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,078       90.78       90.78
          1 |        685        6.85       97.63
          2 |        158        1.58       99.21
          3 |         48        0.48       99.69
          4 |         19        0.19       99.88
          5 |          5        0.05       99.93
          6 |          4        0.04       99.97
          7 |          1        0.01       99.98
          9 |          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