This excludes interceptions and incompletions with no named target.

24.8% 2006
28.5% 2007
30.6% 2008
29.5% 2009
13.7% 2010
19.3% 2011
17.5% 2012
15.1% 2013

TE attempts fell off the cliff in 2010 and haven't recovered, though Doman (11-12) had a higher percentage than Anae (10,13) in that span. Note also that yards/attempt was higher for TEs than WRs from 2006 through 2011, and 2013 is the first year where non-Hoffman WRs were more productive per attempt than the TE collective.