SSRS Matrix Dynamic Rows and Columns -- How to Compare one cell with another

I have a problem which I hope someone can help me with

Assuming this is the data set

Year Month Amount

2009 01 500

2010 01 300

2011 01 400

2008 01 400

I would like a grid to show:

   2008     2009       2010       2011

01 400 higher lower same

I've used the Matrix (tablix) capability to produce a grid

   2008     2009       2010       2011

01 400 500 300 400

but I'm not sure how to pr开发者_StackOverflowoceed from here.

Any advice would be appreciated.

thanks,