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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         43 |          2        0.02        0.02
         49 |          1        0.01        0.03
         59 |          1        0.01        0.04
         60 |         35        0.35        0.39
         62 |          4        0.04        0.43
         63 |          5        0.05        0.48
         64 |         17        0.17        0.65
         65 |         11        0.11        0.76
         66 |          8        0.08        0.84
         67 |         25        0.25        1.09
         68 |         29        0.29        1.38
         69 |         38        0.38        1.76
         70 |         30        0.30        2.06
         71 |         51        0.51        2.57
         72 |         44        0.44        3.01
         73 |         59        0.59        3.60
         74 |         88        0.88        4.48
         75 |         48        0.48        4.96
         76 |        131        1.31        6.27
         77 |        143        1.43        7.70
         78 |        240        2.40       10.10
         79 |        285        2.85       12.95
         80 |        177        1.77       14.72
         81 |        221        2.21       16.93
         82 |        228        2.28       19.21
         83 |        273        2.73       21.94
         84 |        429        4.29       26.23
         85 |        563        5.63       31.86
         86 |        613        6.13       37.99
         87 |        543        5.43       43.42
         88 |        541        5.41       48.83
         89 |        568        5.68       54.51
         90 |        461        4.61       59.12
         91 |        589        5.89       65.01
         92 |        553        5.53       70.54
         93 |        564        5.64       76.18
         94 |        762        7.62       83.80
         95 |        677        6.77       90.57
         96 |         13        0.13       90.70
         99 |        203        2.03       92.73
          . |        727        7.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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