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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,496       54.96       54.96
       2006 |        281        2.81       57.77
       2007 |        941        9.41       67.18
       2008 |      1,665       16.65       83.83
       2009 |      1,165       11.65       95.48
       9999 |        411        4.11       99.59
          . |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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