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

 Model Year |      Freq.     Percent        Cum.
------------+-----------------------------------
         12 |          5        0.05        0.05
         36 |          2        0.02        0.07
         42 |          1        0.01        0.08
         47 |          4        0.04        0.12
         48 |          2        0.02        0.14
         49 |          7        0.07        0.21
         50 |          5        0.05        0.26
         51 |          2        0.02        0.28
         52 |          5        0.05        0.33
         53 |          7        0.07        0.40
         54 |          5        0.05        0.45
         55 |          2        0.02        0.47
         56 |          4        0.04        0.51
         57 |          5        0.05        0.56
         58 |          1        0.01        0.57
         59 |          8        0.08        0.65
         60 |         22        0.22        0.87
         61 |         19        0.19        1.06
         62 |         20        0.20        1.26
         63 |         31        0.31        1.57
         64 |         57        0.57        2.14
         65 |         99        0.99        3.13
         66 |        180        1.80        4.93
         67 |        107        1.07        6.00
         68 |        136        1.36        7.36
         69 |        211        2.11        9.47
         70 |        229        2.29       11.76
         71 |        220        2.20       13.96
         72 |        337        3.37       17.33
         73 |        406        4.06       21.39
         74 |        400        4.00       25.39
         75 |        346        3.46       28.85
         76 |        487        4.87       33.72
         77 |        551        5.51       39.23
         78 |        727        7.27       46.50
         79 |        627        6.27       52.77
         80 |        474        4.74       57.51
         81 |        562        5.62       63.13
         82 |        615        6.15       69.28
         83 |        603        6.03       75.31
         84 |        812        8.12       83.43
         85 |        642        6.42       89.85
         86 |         29        0.29       90.14
         99 |        188        1.88       92.02
          . |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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