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

       Last |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,273       42.73       42.73
         81 |        367        3.67       46.40
         82 |      1,074       10.74       57.14
         83 |      2,127       21.27       78.41
         84 |      1,499       14.99       93.40
         99 |        660        6.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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