Source: http://latino.foxnews.com/latino/news/2012/01/26/zetas-now-mexicos-biggest-cartel-report-says/
As of 26Jan12, FOXNEWs/STRATFOR numbers stated the Mexican government reported 12,903 people were killed in 2011, for a total of "47,515" killed beginning in 2006.
However, multiple sources indicate the numbers for 2011 may be significantly higher, but with the overall total remaining the same as noted here: http://www.mexdrugcartels.com/2012/01/mexican-drug-cartel-situation-report_26.html .
This is based on the following source information:
Sources:
McCaffrey, Barry. After Action Report – General Barry R McCaffrey USA (Ret) VISIT MEXICO – 507 DECEMBER 2008. 29Dec08.http://www.mccaffreyassociates.com/pdfs/Mexico_AAR_-_December_2008.pdf; Accessed 25Jan12
Finklea, Kristin, William Krouse and Mark Randol. Congressional Research Service: Southwest Border Violence: Issues in Identifying and Measuring Spillover Violence. 25Jan11. http://opencrs.com/document/R41075/. Accessed 25Jan12.
Smith, Phillip. Mexico 2010 Death Toll Higher Than Afghanistan. 3Jan11.http://stopthedrugwar.org/chronicle/2011/jan/03/mexico_2010_death_toll_higher_af. Accessed 25Jan12.
Cave, Damien. Mexico Updates Death Toll in Drug War to 47,515, but Critics Dispute the Data. 11Jan12.http://www.borderlandbeat.com/2012/01/mexico-updates-death-toll-in-drug-war.html. Accessed 25Jan12