Executing the same SSIS Package with different parameters at different time

I have a SSIS package running at 8 PM in the evening for the Year 2011.

I would like to run the same package at 8:30 PM for the Year 2010.

I made a SSIS Package configuration file and accept the "Year" as a parameter. Whenever I run, I need to open a file, change the value and run it.

Is it possible to set up the schedule and set the Year value dynamically?

Or using 2 different configuration file is the only way to solve it?

Thanks all.