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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
         18 |          1        0.01        0.02
         34 |          1        0.01        0.03
         40 |          2        0.02        0.05
         49 |          2        0.02        0.07
         50 |          1        0.01        0.08
         52 |          1        0.01        0.09
         53 |          1        0.01        0.10
         55 |          4        0.04        0.14
         56 |          3        0.03        0.17
         57 |          2        0.02        0.19
         58 |          1        0.01        0.20
         59 |          1        0.01        0.21
         60 |          2        0.02        0.23
         61 |          5        0.05        0.28
         62 |         14        0.14        0.42
         63 |         12        0.12        0.54
         64 |         10        0.10        0.64
         65 |         21        0.21        0.85
         66 |         16        0.16        1.01
         67 |         22        0.22        1.23
         68 |         33        0.33        1.56
         69 |         42        0.42        1.98
         70 |         39        0.39        2.37
         71 |         35        0.35        2.72
         72 |         45        0.45        3.17
         73 |         71        0.71        3.88
         74 |         68        0.68        4.56
         75 |         65        0.65        5.21
         76 |        103        1.03        6.24
         77 |        136        1.36        7.60
         78 |        185        1.85        9.45
         79 |        211        2.11       11.56
         80 |        190        1.90       13.46
         81 |        228        2.28       15.74
         82 |        227        2.27       18.01
         83 |        267        2.67       20.68
         84 |        420        4.20       24.88
         85 |        471        4.71       29.59
         86 |        566        5.66       35.25
         87 |        514        5.14       40.39
         88 |        642        6.42       46.81
         89 |        634        6.34       53.15
         90 |        577        5.77       58.92
         91 |        603        6.03       64.95
         92 |        512        5.12       70.07
         93 |        663        6.63       76.70
         94 |        674        6.74       83.44
         95 |        767        7.67       91.11
         96 |        523        5.23       96.34
         97 |         57        0.57       96.91
         99 |        309        3.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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