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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,238       52.38       52.38
       2004 |        229        2.29       54.67
       2005 |        865        8.65       63.32
       2006 |      1,712       17.12       80.44
       2007 |      1,356       13.56       94.00
       9999 |        553        5.53       99.53
          . |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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