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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         32 |          1        0.01        0.01
         42 |          1        0.01        0.02
         45 |          2        0.02        0.04
         52 |          1        0.01        0.05
         55 |          2        0.02        0.07
         56 |          3        0.03        0.10
         57 |          5        0.05        0.15
         58 |          3        0.03        0.18
         59 |          2        0.02        0.20
         60 |          3        0.03        0.23
         61 |          3        0.03        0.26
         62 |          7        0.07        0.33
         63 |         12        0.12        0.45
         64 |         12        0.12        0.57
         65 |         19        0.19        0.76
         66 |         20        0.20        0.96
         67 |         24        0.24        1.20
         68 |         23        0.23        1.43
         69 |         34        0.34        1.77
         70 |         34        0.34        2.11
         71 |         42        0.42        2.53
         72 |         45        0.45        2.98
         73 |         66        0.66        3.64
         74 |         59        0.59        4.23
         75 |         45        0.45        4.68
         76 |         67        0.67        5.35
         77 |        119        1.19        6.54
         78 |        126        1.26        7.80
         79 |        154        1.54        9.34
         80 |        147        1.47       10.81
         81 |        168        1.68       12.49
         82 |        194        1.94       14.43
         83 |        237        2.37       16.80
         84 |        376        3.76       20.56
         85 |        423        4.23       24.79
         86 |        544        5.44       30.23
         87 |        553        5.53       35.76
         88 |        574        5.74       41.50
         89 |        665        6.65       48.15
         90 |        556        5.56       53.71
         91 |        527        5.27       58.98
         92 |        525        5.25       64.23
         93 |        618        6.18       70.41
         94 |        638        6.38       76.79
         95 |        738        7.38       84.17
         96 |        660        6.60       90.77
         97 |        570        5.70       96.47
         98 |         52        0.52       96.99
         99 |        301        3.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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