I'm not sure. I only got introduced to steam in late 2007 with Team Fortress 2's release and I'm pretty sure statistics didn't exist back then. Wikipedia says RO:OST was released in 2006 so I automatically assumed steam didn't exist either No idea
ROOST released the 15th of March 2006, as I recall it it was one of the earlier non-Valve games on Steam - not the first, I know at least Darwinia, Space Empires IV & Rag Doll Kung Fu came out prior, but I'd guess one of the first ten or so. Steam itself was made public as early as 2002, and in 2004 replaced WON as the online system in Counter-Strike. Not sure when they started showing online statistics though.
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