Frequencies for a_c1_60 variable in snf_rollup2540_96_2011 dataset :

    a_c1_60 |      Freq.     Percent        Cum.
------------+-----------------------------------
      19121 |          1        0.06        0.06
     351862 |          1        0.06        0.11
     353915 |          1        0.06        0.17
    1525045 |          1        0.06        0.22
          . |      1,805       99.78      100.00
------------+-----------------------------------
      Total |      1,809      100.00

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