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

 Model Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         18        0.18        0.18
         29 |          1        0.01        0.19
         38 |          1        0.01        0.20
         39 |          2        0.02        0.22
         40 |          2        0.02        0.24
         41 |          2        0.02        0.26
         43 |          1        0.01        0.27
         44 |          1        0.01        0.28
         46 |          4        0.04        0.32
         47 |          4        0.04        0.36
         48 |          5        0.05        0.41
         49 |          6        0.06        0.47
         50 |          3        0.03        0.50
         51 |          5        0.05        0.55
         52 |          9        0.09        0.64
         53 |          9        0.09        0.73
         54 |         10        0.10        0.83
         55 |         27        0.27        1.10
         56 |         33        0.33        1.43
         57 |         22        0.22        1.65
         58 |         18        0.18        1.83
         59 |         30        0.30        2.13
         60 |         47        0.47        2.60
         61 |         47        0.47        3.07
         62 |         99        0.99        4.06
         63 |        102        1.02        5.08
         64 |        207        2.07        7.15
         65 |        262        2.62        9.77
         66 |        300        3.00       12.77
         67 |        334        3.34       16.11
         68 |        402        4.02       20.13
         69 |        491        4.91       25.04
         70 |        524        5.24       30.28
         71 |        573        5.73       36.01
         72 |        694        6.94       42.95
         73 |        773        7.73       50.68
         74 |        726        7.26       57.94
         75 |        624        6.24       64.18
         76 |        674        6.74       70.92
         77 |        889        8.89       79.81
         78 |      1,058       10.58       90.39
         79 |        852        8.52       98.91
         80 |         14        0.14       99.05
         99 |         95        0.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016