Collusion between Security Forces and Loyalist Groups

I am writing to ask for some information from the PSNI’s legacy unit under the Freedom of Information Act. I am requesting quantitative data to the following question:

How many deaths in Northern Ireland involved suspected collusion between the security forces and Loyalist groups (convicted or otherwise)?

The data requested is between the years of 1969 to 1998.

I would be grateful if this data could be broken down and presented on a per year basis.