Frequencies for first 10,000 rows of pct012k057 variable in sf12010880us30 dataset :

   54 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,076       90.76       90.76
          1 |        732        7.32       98.08
          2 |        133        1.33       99.41
          3 |         35        0.35       99.76
          4 |         14        0.14       99.90
          5 |          2        0.02       99.92
          6 |          4        0.04       99.96
          7 |          1        0.01       99.97
          8 |          1        0.01       99.98
         10 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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