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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,358       53.58       53.58
       1997 |        274        2.74       56.32
       1998 |        961        9.61       65.93
       1999 |      1,644       16.44       82.37
       2000 |      1,287       12.87       95.24
       9999 |        415        4.15       99.39
          . |         61        0.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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