According to the Mexican government, cartel-related homicides claimed around 12,900 lives from January to September 2011 — about 1,400 deaths per month. While this figure is lower than that of 2010, it does not account for the final quarter of 2011. The Mexican government has not yet released official statistics for the entire year, but if the monthly average held until year's end, the overall death toll for 2011 would reach 17,000. Indeed, rather than receding to levels acceptable to the Mexican government, violence in Mexico has persisted, though it seems to have shifted geographically, abating in some cities and worsening in others. For example, while Ciudad Juarez, Chihuahua state, was once again Mexico's deadliest city in terms of gross numbers, the city's annual death toll reportedly dropped substantially from 3,111 in 2010 to 1,955 in 2011. However, such reductions appear to have been offset by increases elsewhere, including Veracruz, Veracruz state; Monterrey, Nuevo Leon state; Matamoros, Tamaulipas state; and Durango, Durango state. Over the past year it has also become evident that a polarization is under way among the country's cartels. Most smaller groups (or remnants of groups) have been subsumed by the Sinaloa Federation, which controls much of western Mexico, and Los Zetas, who control much of eastern Mexico. While a great deal has been said about the fluidity of the Mexican cartel landscape, these two groups have solidified themselves as the country's predominant forces. Of course, the battle lines in Mexico have not been drawn absolutely, and not every entity calling itself a cartel swears allegiance to one side or the other, but a polarization clearly is occurring.