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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,959       39.59       39.59
         76 |          1        0.01       39.60
         77 |      1,544       15.44       55.04
         78 |      1,989       19.89       74.93
         79 |      1,286       12.86       87.79
         80 |        475        4.75       92.54
         99 |        746        7.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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