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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,524       55.24       55.24
       2001 |        226        2.26       57.50
       2002 |        840        8.40       65.90
       2003 |      1,648       16.48       82.38
       2004 |      1,197       11.97       94.35
       9999 |        493        4.93       99.28
          . |         72        0.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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