how many people visit giant's causeway each year?
<answer> A total of 712,714 visited the Giant’s Causeway Visitor Centre in 2007. <context> The Giant’s Causeway Visitor Centre has remained the most visited attraction for the last six years. In 2007 the top ten ranked attractions remained similar to 2006. However 2007 saw seven of the top ten attractions experience an annual increase. A total of 712,714 visited the Giant’s Causeway Visitor Centre in 2007, up 29% on the previous year. Belfast Zoological Gardens ranked second, attracting 294,935 visitors in 2007, an increase of 14%.