Economy Census Results Fact File (Economy) (Census Results) GDP/GVA Fact File (Economy) (Gross Value Added (GVA) and Gross Domestic Product (GDP)) Agriculture and Crofting Crofting is the predominant form of land use in the Western Isles and is the foundation of the way of life, the language and the culture. About 77% of the land area is held in crofting tenure and is therefore subject to crofting legislation. Aquaculture and Fisheries Fact File (Economy) (Aquaculture and Fisheries)