Frequencies for mod_year variable in vehicle dataset :

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         65 |          1        0.13        0.13
         66 |          1        0.13        0.26
         68 |          1        0.13        0.39
         69 |          4        0.52        0.92
         70 |          7        0.92        1.83
         71 |          3        0.39        2.23
         72 |          5        0.65        2.88
         73 |          7        0.92        3.80
         74 |          6        0.79        4.58
         75 |          3        0.39        4.97
         76 |          7        0.92        5.89
         77 |         15        1.96        7.85
         78 |         16        2.09        9.95
         79 |         23        3.01       12.96
         80 |         20        2.62       15.58
         81 |         36        4.71       20.29
         82 |         24        3.14       23.43
         83 |         20        2.62       26.05
         84 |         37        4.84       30.89
         85 |         40        5.24       36.13
         86 |         51        6.68       42.80
         87 |         48        6.28       49.08
         88 |         34        4.45       53.53
         89 |         47        6.15       59.69
         90 |         36        4.71       64.40
         91 |         22        2.88       67.28
         92 |         27        3.53       70.81
         93 |         50        6.54       77.36
         94 |         75        9.82       87.17
         95 |         49        6.41       93.59
         99 |         49        6.41      100.00
------------+-----------------------------------
      Total |        764      100.00

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