johnny.g 0 Junior Poster in Training

hi all..
i have created a cube in bids..here i am stuck in a very bad way.i have a measure called as total and a dimension called as date..what i want is a measure which will calculate the difference of the total for the years..eg..for 2007 total is 5 and for 2008 total is 3..the difference should be 3
is there any way to get this..if yes,then please reply..