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 |      5,311       53.11       53.11
       2010 |        443        4.43       57.54
       2011 |        728        7.28       64.82
       2012 |        661        6.61       71.43
       2013 |        994        9.94       81.37
       2014 |        885        8.85       90.22
       2015 |        444        4.44       94.66
       9998 |         51        0.51       95.17
       9999 |        483        4.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016