(Reuters) – The Norwegian island of Finnoey has the highest density of electric cars in the world. The reason? They are exempt from the $6,000-a-year toll charges for the tunnel to the mainland.There has been a surge in sales of fully electric cars like Teslas (TSLA.O) and Nissan (7201.T) Leafs since the tunnel opened in 2009 and they now account for one in five cars on Finnoey, compared with less than 1 in 100 globally. Twenty-nine percent of all new car registrations in Norway were fully electric or plug-in hybrids last year, according to the International Energy Agency, far ahead of the Netherlands in second on 6.4 percent and Sweden in third on 3.4. China had almost 1.5 percent and the United States less than one. Les mer her