(Decanter) - Spain’s wine export business has shown substantial growth in the first half of 2012. Castilla-La Mancha remains the biggest exporter, accounting for 50% of all Spanish wine sold abroad; all but three of Spain’s 17 regions showed at least some growth. Rioja was one of the regions which saw a drop in exports, of 2.5% in volume, but with an increase of 4.9% in value, which would indicate that more wine with the top-level DOPCa Rioja label was sold, and less Vino de Mesa, of which the region is a major producer.