“Despite a slight dip in attendance after the 2008 financial crisis, the museum has welcomed more than 20 million visitors – two-thirds of them from abroad – since it opened on 19 October 1997. In a city of around 350,000 people, the original feasibility study calculated that 400,000 visitors a year were needed to justify the initial expense (estimated at $228m by the economist Beatriz Plaza) and ongoing subsidy (currently around €9m a year).”