The exclusions in sonar is not helping in increasing the overall code coverage

I am using Version 1.0.109
I am not sure how it is deployed in our company.
I am trying to improve the code coverage for our project. I can able to exclude packages or classes from sonar coverage , but I am seeing that when I exclude any package from code coverage it is decreasing the total coverage. In my calculation it should increase the code coverage when I am excluded classes which don’t have code coverage. For example sonar by default exclude Mapper classes but when it calculates the average it is also keeping the Mapper class in consideration. I don’t want to include the packages in average calculation for which I have added exclusions. How can I achive that?

That’s a weird version! Where are you getting that from?