The Home Office does not publish data on any in country applications for leave from EU nationals, but does publish information on a small number of out of country visa applications and grants. The latest published data can be found at:
EU nationals benefit from a right to reside in the UK which is derived from Directive 2004/38/EC (‘the Free Movement Directive’), as implemented by the Immigration (European Economic Area) Regulations 2016. This legislation does not require EU nationals to hold any form of leave under the UK’s domestic Immigration Rules in order to remain in the UK. However, they can apply for leave to remain if they wish.