The Home Office wrote to the Home Affairs Select Committee on 25 June 2018 detailing information relating to wrongful detention compensation claims. A copy of the response can be found here: https://www.parliament.uk/documents/commons-committees/home-affairs/Correspondence-17-19/180625_Permanent_Secretary_Immigration%20Enforcement.pdf
For FY17/18 figure, please refer to the HO Annual Report and Accounts 2017/18 page 97, link below:
For FYs 2010/11 and 2011/12, the Home Office does not hold the information in the format requested. Our ledger will not allow us to provide this level of detail for those Financial Years.