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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,324       53.24       53.24
       1998 |        313        3.13       56.37
       1999 |        921        9.21       65.58
       2000 |      1,659       16.59       82.17
       2001 |      1,323       13.23       95.40
       9999 |        408        4.08       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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