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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,967       49.67       49.67
         89 |        310        3.10       52.77
         90 |      1,041       10.41       63.18
         91 |      1,791       17.91       81.09
         92 |      1,399       13.99       95.08
         99 |        492        4.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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