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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         23 |          1        0.01        0.01
         30 |          1        0.01        0.02
         43 |          1        0.01        0.03
         46 |          1        0.01        0.04
         47 |          2        0.02        0.06
         49 |          1        0.01        0.07
         51 |          2        0.02        0.09
         52 |          1        0.01        0.10
         55 |          1        0.01        0.11
         57 |          3        0.03        0.14
         59 |          4        0.04        0.18
         60 |          3        0.03        0.21
         62 |         11        0.11        0.32
         63 |          8        0.08        0.40
         64 |         24        0.24        0.64
         65 |         26        0.26        0.90
         66 |         23        0.23        1.13
         67 |         29        0.29        1.42
         68 |         35        0.35        1.77
         69 |         36        0.36        2.13
         70 |         50        0.50        2.63
         71 |         69        0.69        3.32
         72 |         63        0.63        3.95
         73 |         77        0.77        4.72
         74 |         88        0.88        5.60
         75 |         77        0.77        6.37
         76 |        133        1.33        7.70
         77 |        165        1.65        9.35
         78 |        211        2.11       11.46
         79 |        275        2.75       14.21
         80 |        227        2.27       16.48
         81 |        246        2.46       18.94
         82 |        277        2.77       21.71
         83 |        313        3.13       24.84
         84 |        440        4.40       29.24
         85 |        559        5.59       34.83
         86 |        624        6.24       41.07
         87 |        576        5.76       46.83
         88 |        606        6.06       52.89
         89 |        658        6.58       59.47
         90 |        536        5.36       64.83
         91 |        612        6.12       70.95
         92 |        582        5.82       76.77
         93 |        602        6.02       82.79
         94 |        768        7.68       90.47
         95 |        634        6.34       96.81
         96 |         30        0.30       97.11
         99 |        289        2.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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