Frequencies for first 10,000 rows of pct012o181 variable in sf12000860us30 dataset :

   74 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,748       87.48       87.48
          1 |        889        8.89       96.37
          2 |        194        1.94       98.31
          3 |         78        0.78       99.09
          4 |         38        0.38       99.47
          5 |         17        0.17       99.64
          6 |         12        0.12       99.76
          7 |          6        0.06       99.82
          8 |         10        0.10       99.92
          9 |          1        0.01       99.93
         11 |          2        0.02       99.95
         12 |          2        0.02       99.97
         13 |          2        0.02       99.99
         16 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017