Greater London's population declined steadily in the decades after the Second World War, from an estimated peak of 8.6 million in 1939 to around 6.8 million in <answer>the 1980s</answer>. The principal ports for London moved downstream to Felixstowe and Tilbury, with the London Docklands area becoming a focus for regeneration, including the Canary Wharf development. This was borne out of London's ever-increasing role as a major international financial centre during <answer>the 1980s</answer>. The Thames Barrier was completed in <answer>the 1980s</answer> to protect London against tidal surges from the North Sea.
When was construction on the Thames Barrier completed?
the 1980s