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

 MODEL YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         45 |          1        0.01        0.01
         46 |          4        0.04        0.05
         49 |          2        0.02        0.07
         51 |          1        0.01        0.08
         52 |          2        0.02        0.10
         53 |          3        0.03        0.13
         55 |          2        0.02        0.15
         56 |          1        0.01        0.16
         57 |          1        0.01        0.17
         58 |          4        0.04        0.21
         59 |          3        0.03        0.24
         60 |          2        0.02        0.26
         61 |          2        0.02        0.28
         62 |         14        0.14        0.42
         63 |         11        0.11        0.53
         64 |         20        0.20        0.73
         65 |         30        0.30        1.03
         66 |         41        0.41        1.44
         67 |         51        0.51        1.95
         68 |         46        0.46        2.41
         69 |         58        0.58        2.99
         70 |         59        0.59        3.58
         71 |         85        0.85        4.43
         72 |        125        1.25        5.68
         73 |        137        1.37        7.05
         74 |        124        1.24        8.29
         75 |        146        1.46        9.75
         76 |        194        1.94       11.69
         77 |        325        3.25       14.94
         78 |        431        4.31       19.25
         79 |        438        4.38       23.63
         80 |        376        3.76       27.39
         81 |        387        3.87       31.26
         82 |        405        4.05       35.31
         83 |        426        4.26       39.57
         84 |        554        5.54       45.11
         85 |        668        6.68       51.79
         86 |        647        6.47       58.26
         87 |        719        7.19       65.45
         88 |        686        6.86       72.31
         89 |        772        7.72       80.03
         90 |        562        5.62       85.65
         91 |        472        4.72       90.37
         92 |         17        0.17       90.54
         99 |        149        1.49       92.03
          . |        797        7.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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