2007 Chart font
 

How do I change the font for the header of the Data Table? Its set up so on
the axis on the left it says 2006, 2007, and 2008. The axis along the top has
17, 22, 50. The boxes have the total number of times 17 22 and 50 were used
in each year. I would like to change the font for the 17, 22, and 50 since
its the same size as the number of times they were used, and doesn't stand
out at all. Can this be done? Thanks!