If you want one mark for each employee and year combination, the easiest option is to structure your data source such that each employee and year combination has one data row.
As a result, make changes to your data source to include the following columns:
Then try Employee on Detail, Year on colour (as a dimension), SUM(Calls) on Columns and Sum(Revenue) on Rows
If you don't want to preprocess your data, you can achieve the same result in the Data Source editing panel by UNIONing the original source with itself, adding a Year field based on the Table Name field, and creating calculated fields to have versions of Calls and Revenue that only include the values for that one.
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