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 |      6,048       60.48       60.48
       2010 |        269        2.69       63.17
       2011 |        852        8.52       71.69
       2012 |      1,390       13.90       85.59
       2013 |      1,003       10.03       95.62
       9998 |         69        0.69       96.31
       9999 |        369        3.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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