Frequencies for a_c2_44 variable in snf_rollup2540_96_2011 dataset :

    a_c2_44 |      Freq.     Percent        Cum.
------------+-----------------------------------
       1367 |          1        0.06        0.06
      23537 |          1        0.06        0.11
     142466 |          1        0.06        0.17
     709740 |          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