You may find the call attempts (Bid times), connect times, answer times for each trunk group from your NMS (M2000) [see TKGRP Traffic]. For trunk group wise data, go to object setting and select the TGs for which you want to find the counters.
Connected Ratio=Calls connected times/Bid times, Answer Ratio=Anwer Times/Bid Times,
Seizure Ratio=Seizure times/bid times, Connection to Seizure Ratio=call connected times/seizure times, Answer to Seizure Ratio =answer times/seizure times.
For aggregate values you should take the data to exel sheet and use sum formula or put into pivot table for required result.