I'd say 2013-14, I believe Snow even came out and said he received very few calls on Vanek.
Two biggest trades were for allstars at the time, which were:
MSL for 1st, 2nd Callahan
Miller + Ott for Halak, 1st, 3rd, Carrier, Stewart
None of the other players returned a 1st.
Gaborik for Frattin, 2nd Cond. 3rd
Vanek + 5th for Collberg + Cond. 2nd
Hemsky for 3rd + 5th
Macdonald for 2nd, 3rd
However, even then the potential free agent market was weaker. This will most likely be one of the strongest free agent classes in a long time, which means there will be a lot of players available at the deadline as well compared to past years.