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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         28 |          1        0.01        0.01
         38 |          1        0.01        0.02
         40 |          1        0.01        0.03
         51 |          1        0.01        0.04
         53 |          1        0.01        0.05
         54 |          2        0.02        0.07
         55 |          2        0.02        0.09
         56 |          3        0.03        0.12
         57 |          5        0.05        0.17
         58 |          4        0.04        0.21
         59 |          4        0.04        0.25
         60 |          9        0.09        0.34
         61 |          3        0.03        0.37
         62 |         10        0.10        0.47
         63 |         13        0.13        0.60
         64 |         23        0.23        0.83
         65 |         38        0.38        1.21
         66 |         30        0.30        1.51
         67 |         38        0.38        1.89
         68 |         41        0.41        2.30
         69 |         56        0.56        2.86
         70 |         79        0.79        3.65
         71 |         66        0.66        4.31
         72 |         76        0.76        5.07
         73 |        112        1.12        6.19
         74 |        105        1.05        7.24
         75 |        101        1.01        8.25
         76 |        131        1.31        9.56
         77 |        213        2.13       11.69
         78 |        300        3.00       14.69
         79 |        313        3.13       17.82
         80 |        292        2.92       20.74
         81 |        310        3.10       23.84
         82 |        341        3.41       27.25
         83 |        364        3.64       30.89
         84 |        521        5.21       36.10
         85 |        564        5.64       41.74
         86 |        602        6.02       47.76
         87 |        585        5.85       53.61
         88 |        639        6.39       60.00
         89 |        687        6.87       66.87
         90 |        556        5.56       72.43
         91 |        605        6.05       78.48
         92 |        543        5.43       83.91
         93 |        720        7.20       91.11
         94 |        553        5.53       96.64
         95 |         34        0.34       96.98
         99 |        302        3.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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