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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,811       48.11       48.11
         88 |        897        8.97       57.08
         89 |      1,778       17.78       74.86
         90 |      1,393       13.93       88.79
         91 |        531        5.31       94.10
         99 |        590        5.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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