Frequencies for first 10,000 rows of pct012c196 variable in sf12000860us18 dataset :

   89 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,878       98.78       98.78
          1 |        114        1.14       99.92
          2 |          4        0.04       99.96
          3 |          3        0.03       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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