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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,364       53.64       53.64
       2002 |        215        2.15       55.79
       2003 |        840        8.40       64.19
       2004 |      1,598       15.98       80.17
       2005 |      1,348       13.48       93.65
       9999 |        572        5.72       99.37
          . |         63        0.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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