MPC's New patients created analysis and New Patients Summary reports are the best for this.
The closest EXACT can get is by using the 'New patients by referral' report.
The report will still show ALL patients added onto EXACT in the time period specified with or without a referral source but the Patients must of had an appointment, not just been registered.
This is why MPC is better as it will report on all new patients created.
see: What is MPC?