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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         40 |          1        0.01        0.01
         50 |          3        0.03        0.04
         52 |          1        0.01        0.05
         55 |          3        0.03        0.08
         56 |          3        0.03        0.11
         58 |          2        0.02        0.13
         60 |          2        0.02        0.15
         61 |          1        0.01        0.16
         62 |          6        0.06        0.22
         63 |          1        0.01        0.23
         64 |          1        0.01        0.24
         65 |         21        0.21        0.45
         66 |         18        0.18        0.63
         67 |         30        0.30        0.93
         68 |         28        0.28        1.21
         69 |         28        0.28        1.49
         70 |         39        0.39        1.88
         71 |         28        0.28        2.16
         72 |         27        0.27        2.43
         73 |         54        0.54        2.97
         74 |         56        0.56        3.53
         75 |         52        0.52        4.05
         76 |         66        0.66        4.71
         77 |        122        1.22        5.93
         78 |        193        1.93        7.86
         79 |        190        1.90        9.76
         80 |        157        1.57       11.33
         81 |        191        1.91       13.24
         82 |        188        1.88       15.12
         83 |        230        2.30       17.42
         84 |        386        3.86       21.28
         85 |        413        4.13       25.41
         86 |        541        5.41       30.82
         87 |        468        4.68       35.50
         88 |        602        6.02       41.52
         89 |        651        6.51       48.03
         90 |        534        5.34       53.37
         91 |        590        5.90       59.27
         92 |        493        4.93       64.20
         93 |        656        6.56       70.76
         94 |        689        6.89       77.65
         95 |        802        8.02       85.67
         96 |        452        4.52       90.19
         97 |         45        0.45       90.64
         99 |        241        2.41       93.05
          . |        695        6.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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