Spanish red grape Tempranillo is the most-expanded variety since 2000.
This is not due to Tempranillo’s ‘internationalisation’, but rather that it has replaced Airén* as Spain’s most planted variety. 80% of its plantings remain in its motherland.
Between 2000 and 2016, plantings of Tempranillo in Spain rose by 114,000ha while Airén declined by 184,000ha.
This fact comes from a new version of the book Which Winegrape Varieties are Grown Where which is a snip at £45 from Amazon if you want it printed, or for the rounded figure of £0.00 for the PDF which is downloadable for free from https://www.adelaide.edu.au/press/titles/winegrapes.
*I don’t know if it still is, but Airén is or was the world’s most planted wine grape variety, and yet few wine drinkers have heard of it or drunk it. I once had an Airén lend from Morrisons (can’t remember what the other grape was.
Source of above (edited) quote is here