How common is Spanish as a second language worldwide?

[Cranberry]

In Austria, Spanish is part of a "third-tier" of languages being taught, together with Russian. English is obviously taught in all schools, followed in frequency by French and Italian as a sort of "second-tier" languages. Spanish and Russian then follow, and they are either taught as third languages from grade 9/10 on, or, in fewer schools, as second languages from grade 7/8/9 on. But as said, French and Italian are both far more common, and especially Italian is increasing in popularity (which might have to do with the fact that most Austrians live, like, at most three hours from Italy).

Interestingly however, the Slavic languages surrounding Austria are, with the expection of bilingual schools for the minorities (Slovenians, Croats, Hungarians), practically not taught at all, and I doubt many Austrians speak Czech, for instance, even though it's so close to Austria. Russian is basically the only Slavic language being taught, and that almost exclusively as a third language.