You are not entitled to or have a need to know this. They are like medical records, or rather, the records of very direct confrontation in spiritual warfare between the soldiers of Christ and the principalities of evil. Try asking any military hospital or any government to disclose similar records simply because you are curious and see how they reply.
If you truly want to learn about this, some priests, psychiatrists, or lay faithful who are competent on the matter have written books on the topic, such as:
- “Exorcism and the Church Militant”, Fr. Thomas Euteneur
- “Interview With an Exorcist”, Fr. Jose Antonio Fortea
- “An Exorcist tells his story”, Fr. Gabriele Amorth
- “Exorcist in the XXIst Century”. Fr. Gabriele Amorth
- “What You Need to Know About Exorcism”, Fr. Gary Thomas
- “The Rite: the Making of a Modern Exorcist”, Mark Baglio
- “Resisting the Devil”, Neal Lozano
- “People of the Lie”, Dr. Scott Peck
- “Glimpses of the Devil: A Psychiatrist’s Personal Accounts”, Dr. Scott Peck
- “Angels and Demons: What Do We Really Know”, Peter Kreeft
- “The Dark Sacrament”, David Kiely
Also, it is not something every priest can do. While all bishops are authorized to carry out this blessing, they usually give the ministry and authority to a competent priest. In fact there are even official courses, one of which became renowned because it was (still is, I believe) taught in Rome, at the Pontifical Athenaeum Regina Apostolorum (see f.ex.
here for one taking place on May 5-10, 2014).