Frequencies for a_c2_5020 variable in snf_rollup2540_96_1997 dataset :

  a_c2_5020 |      Freq.     Percent        Cum.
------------+-----------------------------------
       1298 |          1        0.01        0.01
     163934 |          1        0.01        0.02
          . |     11,916       99.98      100.00
------------+-----------------------------------
      Total |     11,918      100.00

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