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

    Date of |
Last crash, |
 suspension |
         or |
 conviction |
     (Year) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,480       54.80       54.80
       2008 |        290        2.90       57.70
       2009 |        966        9.66       67.36
       2010 |      1,614       16.14       83.50
       2011 |      1,184       11.84       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