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

    Date of |
Last crash, |
 suspension |
         or |
 conviction |
     (Year) |      Freq.     Percent        Cum.
------------+-----------------------------------
         -1 |         15        0.15        0.15
          0 |      5,586       55.86       56.01
       2007 |        278        2.78       58.79
       2008 |        896        8.96       67.75
       2009 |      1,703       17.03       84.78
       2010 |      1,088       10.88       95.66
       9999 |        387        3.87       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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