Adding features to an Excel application

I have an Excel application which includes a base sheet with data for 2009, 2010, 2011 and 2012, and at the moment it is set up to generate data from the base when I enter a query. That data can be for any of the four years, depending which best answers the query. Without removing any data from the base sheet, I want to add a facility to limit the search after a query to one of four selectable options: 1) searches all four years data (the default position), 2) searches only 2010, 2011 and 2012 data, 3) searches only 2011 and 2012 data, 4) searches only 2012 data. Plus, the facility needs to be able to be easily adjusted at the start of each year, as on 1 January 2013 the 2009 data will be jettisoned and data from 2013 will start to be added. A copy of the application will be sent to bidders who (a) have a proven Freelancer.com record of success in completing Excel projects and (b) can complete it to the very short deadline required in this instance (needs to be completed today).