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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,191       41.91       41.91
         79 |      1,394       13.94       55.85
         80 |      1,950       19.50       75.35
         81 |      1,239       12.39       87.74
         82 |        446        4.46       92.20
         99 |        780        7.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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