Best way to modify a column header

[Steve LaForge]

I have a series of subreports that show 2-up values.  For example, 2013 and 2012 values side-by-side for comparison.  Instead of having the column headers say 'This Year Results' and 'Last Year Results', I want them to say '2013 Results' and '2012 Results'.  What is the best / most-efficient way to accomplish this?

Thank you!
Steve