The Office for National Statistics (ONS) publishes annual estimates of gross value added for the nine English regions and each of the devolved countries.
The latest publication covers the year 2010 and is available here:
Data for 2011 will be published in December 2012.
Every quarter, the ONS also produces on behalf of the Welsh Government the Index of Production and Construction and the Welsh Index of Market Services. These indices show the short-term movements in the output of production, construction and market service sector companies within Wales:
The latest publications cover the fourth quarter of 2011 and are available here:
Data for the first quarter of 2012 will be published on