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When will electric cars constitute over 5% of the Japanese passenger car fleet?

Japan is one of the largest electric vehicle markets in the world, behind only China, the USA, and Norway in total stock, as well as being the origin country of the Toyota Prius, the first mass-produced hybrid-electric vehicle. According to Statista, in 2018, 1.13% of motor vehicles in Japan were electric cars.

When will electric cars constitute over 5% of the cars on the roads in Japan?

The date is resolved by the earliest credible report in a respectable publication that provides statistics from which it follows that the number of electric cars on Japanese roads is over 5% of the total number of passenger cars.

For the purpose of this question, an electric car is any vehicle which is classified as a "passenger car", and whose sole energy input is electrical energy, delivered either by plugging it into an electrical energy source or replacing an electrical battery (including a fuel cell), or similar means. Hybrid vehicles that have both an electric and any other non-electric (gasoline, diesel, etc.) engine do not count as electric cars.

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