KPI shows wrong wrong value

Dear all, I have created KPI card to show the percentage of UserStories "covered" compared to a target.

In my source file a UserStory is either Covered or Not covered; 77% are not Covered

My problem: KPI shows the percentage of UserStories "Not Covered", so exactly the opposite of what i need --> how can I modify this and have the % of UserStories "Covered" shown?

Indicator: %GT Count of FormattedID (= count of UserStories)

Trend Axis: US Test Coverage (=where is indicated if a UserStory is covered or not covered)

Target = 80%

thanks a lot in advance!