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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         31 |          1        0.01        0.01
         49 |          1        0.01        0.02
         53 |          1        0.01        0.03
         54 |          1        0.01        0.04
         55 |          2        0.02        0.06
         56 |          3        0.03        0.09
         57 |          2        0.02        0.11
         58 |          6        0.06        0.17
         59 |         10        0.10        0.27
         60 |          4        0.04        0.31
         61 |          6        0.06        0.37
         62 |          9        0.09        0.46
         63 |          9        0.09        0.55
         64 |         14        0.14        0.69
         65 |         33        0.33        1.02
         66 |         42        0.42        1.44
         67 |         40        0.40        1.84
         68 |         53        0.53        2.37
         69 |         61        0.61        2.98
         70 |         72        0.72        3.70
         71 |         77        0.77        4.47
         72 |        124        1.24        5.71
         73 |        142        1.42        7.13
         74 |        149        1.49        8.62
         75 |        120        1.20        9.82
         76 |        188        1.88       11.70
         77 |        283        2.83       14.53
         78 |        374        3.74       18.27
         79 |        468        4.68       22.95
         80 |        337        3.37       26.32
         81 |        387        3.87       30.19
         82 |        389        3.89       34.08
         83 |        421        4.21       38.29
         84 |        605        6.05       44.34
         85 |        663        6.63       50.97
         86 |        733        7.33       58.30
         87 |        648        6.48       64.78
         88 |        695        6.95       71.73
         89 |        693        6.93       78.66
         90 |        641        6.41       85.07
         91 |        689        6.89       91.96
         92 |        516        5.16       97.12
         93 |         43        0.43       97.55
         99 |        245        2.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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