Sum of Column Percentage

Hi there:

I am trying to calculate percentage of total in a column.  My data is:

Claim_Status_Code

1

1

Total88

I am using the Count function for this field.

I would like to add a second column that will calculate the percentage such as:

Claim_Status_Code Percentage

11%

11%

8898%

Total90 100%

I have tried this:

Creating a new column and inserting this expression:

=((Count(Fields!CLAIM_STATUS_CODE.Value)/(sum(count(Fields!CLAIM_STATUS_CODE4.Value)))) * 100

But is didn't really work.  There has to be an easier way.  Any examples would greatly be appreciated!

Thanks, Brett