| Country or Area | Element | Year | Unit | Value | |
|---|
| United Kingdom of Great Britain and Northern Ireland | Value | 2019 | million No | 1.70 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2018 | million No | 1.60 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2017 | million No | 1.60 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2016 | million No | 1.50 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2015 | million No | 1.50 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2014 | million No | 1.50 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2013 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2012 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2011 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2010 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2009 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2008 | million No | 1.40 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2007 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2006 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2005 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2004 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2003 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2002 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2001 | million No | 1.30 |
| United Kingdom of Great Britain and Northern Ireland | Value | 2000 | million No | 1.30 |
