I'm using CR v8.5. I know you can't use Percentage summaries in a crosstab. Anyone know of a good workaround to get % into a crosstab?

Basically, I have a crosstab with the following:
Rows: Call Center CSR
@Closed by Month (Formula to display by month)
Columns: @24 Hours (Formula to calculate duration of call center ticket)
Summarized: DistinctCount of CallID (tickets opened per CSR)

This works fine to get me this output of how many tickets were closed by a CSR. What I need is to have the percentage of that number against each CSR's total.

Any ideas?