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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,233       42.33       42.33
         82 |      1,265       12.65       54.98
         83 |      1,860       18.60       73.58
         84 |      1,437       14.37       87.95
         85 |        530        5.30       93.25
         99 |        675        6.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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