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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,683       46.83       46.83
         86 |      1,217       12.17       59.00
         87 |      1,790       17.90       76.90
         88 |      1,251       12.51       89.41
         89 |        457        4.57       93.98
         99 |        602        6.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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