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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,993       39.93       39.93
         75 |          3        0.03       39.96
         76 |      1,409       14.09       54.05
         77 |      1,882       18.82       72.87
         78 |      1,375       13.75       86.62
         79 |        438        4.38       91.00
         99 |        900        9.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016