2014. (Discussed here before, I think.) The article kindly submitted here does not represent a majority view among researchers, by the way. Another article you can see for free online (a book chapter by an author whose chapter was part of a book edited by the author of the submission here) presents what I observe to be the more mainstream view.
http://www.tc.umn.edu/~cdeyoung/Pubs/DeYoung_Intelligence-Pe...