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

       Last |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,402       44.02       44.02
         84 |        368        3.68       47.70
         85 |      1,145       11.45       59.15
         86 |      2,039       20.39       79.54
         87 |      1,408       14.08       93.62
         99 |        638        6.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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