How the shares were counted
Published figures only. Every number comes from the body that counts the market, read from its own tables or from a reprint of them. Where a source measured only some years, the chart joins those years with straight lines and marks each one; nothing in between is estimated.
By the company’s home. A market is shared out by where the companies that sell it are based, not by where the factories stand; a joint venture counts for one partner, as each source counts it. Countries groups the companies by the country they are based in, Europe's countries each on their own. Companies shows the firms, grouped by country in the same way. What a source does not break down is never given to a country.
Floors. Where a source sizes only its largest companies, the Chinese companies it leaves out are not counted, and China’s share is shown as “at least”.
Market sizes. The markets are ordered by the value of their world sales in US dollars, each from the latest year a source gives; the figures and their sources are listed below.
Names. Country names follow the Unicode CLDR; companies keep the names they trade under.