Frequencies for first 10,000 rows of opdateyr variable in h126f dataset :

 EVENT DATE |
     - YEAR |      Freq.     Percent        Cum.
------------+-----------------------------------
         -9 |         10        0.10        0.10
         -8 |          3        0.03        0.13
       2009 |      9,987       99.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Feb 2018