Exempting battery engines from taxes imposed on diesel and petrol cars has upended Norway's auto market, elevating brands like Tesla and Nissan, with its Leaf model, while hurting sales of Toyota, Daimler and others. In 2018, Norway's fully electric car sales rose to a record 31.2 percent market share from 20.8 percent in 2017, far ahead of any other nation, and buyers had to wait as producers struggled to keep up with demand. The sales figures consolidate Norway's global lead in electric car sales per capita, part of an attempt by Western Europe's biggest producer of oil and gas to transform to a greener economy. The International Energy Agency (IEA), which includes plug-in hybrids when calculating electric car sales, measured Norway's share of such cars at 39 percent in 2017, far ahead of second-placed Iceland on 12 percent and Sweden on 6 percent. In China, the market share was 2.2 percent in 2017, and in the United States just 1.2 percent, IEA data show. While the numbers will vary from month to month, half of all cars sold in 2019 in Norway will probably be fully electric, the head of the Norwegian Electric Vehicle Association (NEV) said. We are pretty sure we are going to reach 50 percent market share in total this year. Maybe even pass it, which is pretty amazing," NEV Secretary General Christina Bu told Reuters. Cars that rely solely on internal combustion engines with no hybrid electric unit had a market share of only 22.7 percent in March, the lowest on record.