Frequencies for dr_zip variable in vehnit dataset :

 DRIVER ZIP |
       CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
      97068 |          1        0.07        0.07
      99999 |      1,480       99.93      100.00
------------+-----------------------------------
      Total |      1,481      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016