Frequencies for first 10,000 rows of pct012k176 variable in sf12010880us30 dataset :

   69 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,568       95.68       95.68
          1 |        371        3.71       99.39
          2 |         46        0.46       99.85
          3 |          7        0.07       99.92
          4 |          3        0.03       99.95
          5 |          2        0.02       99.97
          6 |          1        0.01       99.98
          8 |          1        0.01       99.99
         11 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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