The year selection is a data validation list. Click on the cell, then click on Data | Data Validation and in the dialogue box you will see the years listed, separated by commas - just continue adding new years and then click OK when you have enough.
Hope this helps.
Pete
P.S. If that takes care of your original question, please select Thread Tools from the menu above your first post and mark this thread as SOLVED.
Also, since you are relatively new to the forum, I would like to inform you that you can directly thank those who have helped you by clicking on the small "star" icon located in the lower left corner of a post that you have found to be helpful (not just in this thread - for any post that has helped you). This also adds to the reputation of the poster (the small green bars in the poster's profile).
Pete
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