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

      First |
Accident,et |
     c-Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,357       43.57       43.57
         83 |      1,218       12.18       55.75
         84 |      1,922       19.22       74.97
         85 |      1,357       13.57       88.54
         86 |        517        5.17       93.71
         99 |        629        6.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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