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

 Model Year |      Freq.     Percent        Cum.
------------+-----------------------------------
         32 |          1        0.01        0.01
         38 |          1        0.01        0.02
         41 |          1        0.01        0.03
         46 |          1        0.01        0.04
         47 |          1        0.01        0.05
         48 |          3        0.03        0.08
         50 |          2        0.02        0.10
         51 |          2        0.02        0.12
         52 |          1        0.01        0.13
         53 |          5        0.05        0.18
         54 |          2        0.02        0.20
         55 |          5        0.05        0.25
         56 |         10        0.10        0.35
         57 |          6        0.06        0.41
         58 |          7        0.07        0.48
         59 |         13        0.13        0.61
         60 |         11        0.11        0.72
         61 |         15        0.15        0.87
         62 |         19        0.19        1.06
         63 |         38        0.38        1.44
         64 |         57        0.57        2.01
         65 |         84        0.84        2.85
         66 |         91        0.91        3.76
         67 |        117        1.17        4.93
         68 |        118        1.18        6.11
         69 |        190        1.90        8.01
         70 |        195        1.95        9.96
         71 |        204        2.04       12.00
         72 |        284        2.84       14.84
         73 |        430        4.30       19.14
         74 |        426        4.26       23.40
         75 |        329        3.29       26.69
         76 |        453        4.53       31.22
         77 |        572        5.72       36.94
         78 |        618        6.18       43.12
         79 |        643        6.43       49.55
         80 |        551        5.51       55.06
         81 |        584        5.84       60.90
         82 |        605        6.05       66.95
         83 |        539        5.39       72.34
         84 |        800        8.00       80.34
         85 |        904        9.04       89.38
         86 |        748        7.48       96.86
         87 |         36        0.36       97.22
         99 |        278        2.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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