Data on UK Visas and Immigration temporary and permanent migration activities including In-Country Work In Progress Casework, and Percentage of Temporary and Permanent Migration in-country visa applications for each Route, processed within Service Standards, is published on the .GOV.UK website. The relevant Routes are ‘Spouse/Partner’ and ‘HR/Complex Case’ as indicated on worksheet InC_01 and InC_01a.
The relevant tables are also attached to this answer.
2015 figures (Excel SpreadSheet, 38.02 KB)
2016 figures (Excel SpreadSheet, 40.81 KB)