Yes - 2012 in practice. To make the question precise, it clarifies that it refers to the term. It would also be interesting to know when people first head of EA avant la lettre - this could mean many things, but hearing of an EA org certainly counts. For my part I heard of GWWC in 2010, from Pablo Stafforini (benthamite here). I read Peter Unger's book Living High and Letting Die in about 2002, which argues for giving large amounts to effective charities, and is perhaps the first mention of Earning to Give.