The Home Office publishes statistics on the number of persons who were removed or departed voluntarily from the UK on a quarterly and annual basis, which are available from the Library of the House and from the Home Office’s Research, Development and Statistics website at:
http://www.homeoffice.gov.uk/rds/immigration-asylum-stats.html
Statistics on removals and voluntary departures, by type, in the last 10 years are provided in table 3.1 of the Control of Immigration: Statistics United Kingdom 2008 bulletin at:
http://www.homeoffice.gov.uk/rds/pdfs09/hosb1409.pdf
Statistics for the first two quarters of 2009 are provided in table 7a/b/c of the Control of Immigration: Quarterly Statistical summary, April to June 2009 at:
http://www.homeoffice.gov.uk/rds/pdfs09/immiq209.pdf
Figures for the third quarter of 2009 will be published on 26 November 2009.