All data has been derived from the transcriptions in the IGI derived from the official 1911 transcription - thus it is a transcription of a transcription of an earlier transcription !
Based on various Church, Civil and, post 1821, Decennial Census data
Something seems amiss with the 1792 figure -
The register starts from 1714 when the church was built, prior to this date the parish shared St Peter's in Peel though it appears it kept a separate register.
Several epidemic peaks can be noted
R.A. Houston The Population History of Britain and Ireland 1500-1750, Macmillan Education Studies in Economic and Social History (ISBN 0-333-56564-9) 1992