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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         31 |          1        0.01        0.01
         39 |          1        0.01        0.02
         45 |          1        0.01        0.03
         46 |          3        0.03        0.06
         47 |          1        0.01        0.07
         49 |          4        0.04        0.11
         50 |          2        0.02        0.13
         51 |          1        0.01        0.14
         52 |          2        0.02        0.16
         53 |          5        0.05        0.21
         54 |          1        0.01        0.22
         55 |          2        0.02        0.24
         56 |          3        0.03        0.27
         57 |          2        0.02        0.29
         58 |          3        0.03        0.32
         59 |          4        0.04        0.36
         60 |          6        0.06        0.42
         61 |          5        0.05        0.47
         62 |         14        0.14        0.61
         63 |         15        0.15        0.76
         64 |         31        0.31        1.07
         65 |         29        0.29        1.36
         66 |         42        0.42        1.78
         67 |         57        0.57        2.35
         68 |         53        0.53        2.88
         69 |         69        0.69        3.57
         70 |         79        0.79        4.36
         71 |         98        0.98        5.34
         72 |        141        1.41        6.75
         73 |        160        1.60        8.35
         74 |        155        1.55        9.90
         75 |        148        1.48       11.38
         76 |        233        2.33       13.71
         77 |        345        3.45       17.16
         78 |        423        4.23       21.39
         79 |        439        4.39       25.78
         80 |        412        4.12       29.90
         81 |        403        4.03       33.93
         82 |        424        4.24       38.17
         83 |        432        4.32       42.49
         84 |        581        5.81       48.30
         85 |        689        6.89       55.19
         86 |        682        6.82       62.01
         87 |        736        7.36       69.37
         88 |        765        7.65       77.02
         89 |        767        7.67       84.69
         90 |        653        6.53       91.22
         91 |        564        5.64       96.86
         92 |         27        0.27       97.13
         99 |        287        2.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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