Question to the Ministry of Defence:

To ask the Secretary of State for Defence, how many full-time reservists there were in each year between 2015 and 2018; and if he will make a statement.

This information can be found in the Quarterly Service Personnel Statistics at Table 3b, which has a breakdown of Full-Time Reservists since 2015:

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/735714/1_July_2018_-_SPS.xlsx