Norwich also records the site of an Anglo-Saxon church in Tombland, the site of the Saxon market place and the later Norman cathedral. Norwich continued to be a major centre for trade, the River Wensum being a convenient export route to the River Yare and Great Yarmouth, which served as the port for Norwich. Quern stones and other artefacts from Scandinavia and the Rhineland have been found during excavations in Norwich city centre. These date from the 11th century onwards. Norwich Castle was founded soon after the Norman Conquest. The Domesday Book records that 98 Saxon homes were demolished to make
Norwich with a large shoemaking industry, but transitioned throughout the 1980s and 1990s to a service-based economy. The greater Norwich economy (which includes Norwich, Broadland and South Norfolk government districts) as measured by GVA was estimated at £7.4 billion in 2011 (2011 GVA at 2006 prices). The city's largest employment sectors are business and financial services (31%), public services (26%), retail (12%), manufacturing (8%) and tourism (7%). Unemployment in urban Norwich and the Norwich City Council area was 2.7% and 3.7% respectively in January 2014, compared to 3% across Great Britain. New developments on the former Boulton and Paul site include