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

 Model Year |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         21        0.21        0.21
         39 |          1        0.01        0.22
         43 |          3        0.03        0.25
         44 |          1        0.01        0.26
         46 |          3        0.03        0.29
         47 |          2        0.02        0.31
         48 |          8        0.08        0.39
         49 |          2        0.02        0.41
         50 |         11        0.11        0.52
         51 |          8        0.08        0.60
         52 |          8        0.08        0.68
         53 |          9        0.09        0.77
         54 |          9        0.09        0.86
         55 |         13        0.13        0.99
         56 |         15        0.15        1.14
         57 |         23        0.23        1.37
         58 |         17        0.17        1.54
         59 |         27        0.27        1.81
         60 |         29        0.29        2.10
         61 |         36        0.36        2.46
         62 |         51        0.51        2.97
         63 |        101        1.01        3.98
         64 |        132        1.32        5.30
         65 |        175        1.75        7.05
         66 |        182        1.82        8.87
         67 |        227        2.27       11.14
         68 |        287        2.87       14.01
         69 |        391        3.91       17.92
         70 |        405        4.05       21.97
         71 |        453        4.53       26.50
         72 |        629        6.29       32.79
         73 |        703        7.03       39.82
         74 |        650        6.50       46.32
         75 |        582        5.82       52.14
         76 |        601        6.01       58.15
         77 |        811        8.11       66.26
         78 |        913        9.13       75.39
         79 |      1,017       10.17       85.56
         80 |        808        8.08       93.64
         81 |        554        5.54       99.18
         82 |         16        0.16       99.34
         99 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016