The Model X was developed from the full-sized sedan platform of the Tesla Model S. The Model X has an EPA Size Class as an SUV, and shares ~30% of its content with the Model S, half of the originally planned ~60%, and weighs about 10 percent more, both are being produced at the Tesla Factory in Fremont, California. First deliveries of the Model X began in September 2015. After one full year on the market, the Model X ranked in 2016 seventh among the world's best-selling plug-in cars. Global cumulative sales since inception totaled about 72,059 units through December 2017.