Frequencies for a_c1_31 variable in snf_rollup2540_96_1995 dataset :

    a_c1_31 |      Freq.     Percent        Cum.
------------+-----------------------------------
      10561 |          1        0.08        0.08
      19596 |          1        0.08        0.16
     105372 |          1        0.08        0.24
     133993 |          1        0.08        0.32
          . |      1,231       99.68      100.00
------------+-----------------------------------
      Total |      1,235      100.00

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