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 |      5,926       59.26       59.26
       2009 |        295        2.95       62.21
       2010 |        924        9.24       71.45
       2011 |      1,456       14.56       86.01
       2012 |        999        9.99       96.00
       9998 |         61        0.61       96.61
       9999 |        339        3.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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