Autonomous vehicles received the largest percentage of private artificial intelligence (AI) investment for 2018 and 2019. Global driverless car technology startups scooped up $7.7bn, accounting for 9.9% of total private AI investment. That's according to the AI Index 2019, a report compiled by the Stanford Human-Centred AI Institute, in collaboration with McKinsey & Company, AI21 Labs, Genpact, Google and OpenAI. The annual report examines the biggest trends in the AI industry between January 2018 and October 2019, such as AI growth by country and the number of peer-reviewed research papers. It found that while autonomous vehicles – also known as AVs – are largely being tested in the US, at least 25 countries are testing them.