Economy of Devon of the railways in the 19th century, Devon's economy has been heavily reliant on tourism. The county's economy has followed the declining trend of British seaside resorts since the mid 20th century, with some recent revival. This revival has been aided by the designation of much of Devon's countryside and coastline as the Dartmoor and Exmoor national parks, and the Jurassic Coast and Cornwall and West Devon Mining Landscape World Heritage Sites. In 2004 the county's tourist revenue was £1.2 billion. The Met Office is in Exeter as is Connaught plc, and Pennon Group, the water company. The Wrigley Company
Operational Guidelines for the Implementation of the World Heritage Convention the World Heritage List and the way to it is to be found in Chapter 2. Before properties can be proposed for inscription as a World Heritage Site, they must be on the tentative lists of the States Parties. The properties must be of Outstanding Universal Value (OUV) which means "cultural and/or natural significance which is so exceptional as to transcend national boundaries and to be of common importance for present and future generations of all humanity". There are ten criteria for the assessment of OUV. Criteria (i)-(vi) for cultural heritage, (vii)-(x) for natural heritage. Properties nominated under criteria (i)