What is the biggest automobile company in the world?
According to the Alliance, it sold one in nine cars worldwide in 2017, ranking as the world's largest producer of light vehicles by sales, with 10,608,366 units sold. In 2017, the Renault-Nissan-Mitsubishi alliance recorded an increase of 6.5% compared to 2016. 
What is the biggest automobile company in the world in 2017?
Renault-Nissan-Mitsubishi Alliance
Renault–Nissan–Mitsubishi Alliance
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What is the biggest automobile company in the world in 2016?
Toyota Motor Corporation Toyota
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What is the biggest automobile company in the world in 2015?
Toyota Motor Corporation Toyota
List of automobile manufacturers
https://en.wikipedia.org/wiki/List%20of%20automobile%20manufacturers
Renault–Nissan–Mitsubishi Alliance
https://en.wikipedia.org/wiki/Renault%E2%80%93Nissan%E2%80%93Mitsubishi%20Alliance
List of manufacturers by motor vehicle production
https://en.wikipedia.org/wiki/List%20of%20manufacturers%20by%20motor%20vehicle%20production
The company was again the top global automaker in 2018, for the fifth consecutive year, selling 10.083 million vehicles in the year 2018, just 7,000 more than the Renault–Nissan–Mitsubishi Alliance
Volkswagen Group
By 2020, Toyota reclaimed its position as the largest automaker in the world, surpassing Volkswagen.
Toyota
In 2018, Volkswagen Group was the largest automaker in the world for the fifth consecutive year, selling 10.083 million vehicles, just 7,000 more than the Renault-Nissan-Mitsubishi Alliance. However, by 2020, Toyota reclaimed its position as the largest automaker in the world, surpassing Volkswagen.