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Yeah, any data to back this up would be great

Any piece of info in particular you wanted sourced, or just all of it? You might need to whip out Google translate.

Jakobsson, Anders; Oscarsson, Magnus; Karlsson, Karl - Göran. Det fria skolvalet hotar kvaliteten Svensk skola. http://www.newsmill.se/artikel/2010/12/09/forskare-fria-skol...

About Sweden's plummeting PISA scores in reading:

PISA 2009 – Executive Summary, OECD 2010 page 15