Frequencies for b_1_c18_49 variable in snf_rollup2540_96_1996 dataset :

 b_1_c18_49 |      Freq.     Percent        Cum.
------------+-----------------------------------
      16817 |          1        0.01        0.01
      18841 |          1        0.01        0.02
          . |      9,606       99.98      100.00
------------+-----------------------------------
      Total |      9,608      100.00

by Jean Roth , jroth@nber.org , 17 Feb 2018