Frequencies for first 10,000 rows of first_yr variable in vehicle dataset :

    Date of |
      First |
     crash, |
 suspension |
         or |
 conviction |
     (Year) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,480       54.80       54.80
       2008 |        840        8.40       63.20
       2009 |      1,507       15.07       78.27
       2010 |      1,214       12.14       90.41
       2011 |        493        4.93       95.34
       9998 |         61        0.61       95.95
       9999 |        405        4.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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