When was the last year that the Cincinnati Bengals swept the Baltimore Ravens?

Denver Bronco's has never won in Baltimore (this doesn't include pre-season):

YearResultLocationScoreSeason2009 LostBAL7-30Regular2006WonDEN13-3Regular2005WonDEN12-10Regular2003LostBAL6-26Regular2002LostBAL23-34Regular2001LostDEN13-20Regular2000LostBAL3-21Playoffs1996WonDen45-34Regular