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

      FIRST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,967       49.67       49.67
         89 |        939        9.39       59.06
         90 |      1,781       17.81       76.87
         91 |      1,257       12.57       89.44
         92 |        564        5.64       95.08
         99 |        492        4.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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