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

       LAST |
ACCIDENT-YE |
         AR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,515       55.15       55.15
       1995 |        264        2.64       57.79
       1996 |        896        8.96       66.75
       1997 |      1,581       15.81       82.56
       1998 |      1,301       13.01       95.57
       9999 |        381        3.81       99.38
          . |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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