Original sentence: , there are over 30 models of highway legal all-electric passenger cars and utility vans available for retail sales, mainly in the United States, China, Japan, Western European countries.By mid-September 2015, about 620,000 light-duty electric vehicles have been sold worldwide out of one million plug-in electric cars sold globally since 2008.The world's top selling highway-capable electric car is the Nissan Leaf, released in December 2010 and sold in 46 countries, with global sales approaching 200,000 units by September 2015, followed by the Tesla Model S with about 85,000 units sold since 2012
Edited sentence: , the number of mass production highway-capable all-electric passenger cars and utility vans available in the market is limited to over 30 models, mainly in the United States, Japan, Western European countries and China., the world's top selling highway-capable electric car is the Nissan Leaf, released in December 2010 and sold in 46 countries, with global sales of over 180,000 units, followed by the Tesla Model S with over 78,000 units sold since 2012.However, battery price is coming down rapidly and sales are increasing, by May 2015 over 500,000 light-duty electric vehicles have been sold worldwide