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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,464       54.64       54.64
       1999 |        254        2.54       57.18
       2000 |        931        9.31       66.49
       2001 |      1,622       16.22       82.71
       2002 |      1,206       12.06       94.77
       9999 |        471        4.71       99.48
          . |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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