Killings in Mexico climbed to new highs in 2016, and the violent rhythm may only intensify
Enrique Pena Nieto Mexico
Enrique Pena Nieto Mexico

(Mexico's President Enrique Pena Nieto gestures during the signing of an agreement relating to trade and transportation of natural gas at the National Palace in Mexico City, March 13, 2015.Edgard Garrido/Reuters)

Mexico recorded the deadliest year of President Enrique Peña Nieto's four-year-old sexenio, or six-year term, in 2016.

The country saw a 22% increase in homicide cases, rising from 17,034 in 2015 to 20,789 in 2016.

Individual homicide cases can contain more than one victim, and data released by the government showed that the number of homicide victims jumped 22.8%, from 18,673 in 2015 to 22,932 last year.

Government data released by the interior ministry each year since 1997 indicates that Peña Nieto's first four years have had 71,808 homicide cases opened, putting his term on pace to exceed those of his two predecessors.

Vicente Fox saw 74,389 homicide cases opened during his term from 2001 to 2006, while Felipe Calderon, who deployed troops around Mexico in the move that is credited with kicking off Mexico's cartel wars, recorded 104,794 homicide cases during his term from 2007 to 2012.

Recent reports by a Mexican nonprofit agency suggest that Mexican state governments, possibly at the direction of the federal government, have been manipulating the number of high- and low-level crimes they report. Such legerdemain may mean that the true number of violent deaths in Mexico is much higher.

Mexico annual homicide cases by sexenio 2000 2016
Mexico annual homicide cases by sexenio 2000 2016

(Mexico has seen a sustained increase in homicides since the late 2000s.Mexican government data/Christopher Woody)

Whatever the true number of homicides, government statistics indicate that they haven't accumulated at a consistent rate over the last decade.

As noted by University of San Diego professor David Shirk, Calderon's term was marked by a significant increase around 2008 and 2009 (2007 had the lowest number of homicides in Mexican history, Shirk said), but the killing slacked off during the first two years of Peña Nieto's term.

"Peña Nieto came into office promising that within the first six months, we would see significant declines in violence," Shirk said during a recent presentation at the Wilson Center in Washington, DC.

"That was extremely ambitious, but we did see a significant year-over-year decrease over the course of 2013 and 2014. And then, starting in 2015 and 2016, the numbers started to creep back up," he added.

While the Mexican government's reported homicide rate was 17 per 100,000 people in 2016, recent data indicates that the country is middle of the pack in Latin America, where countries like Venezuela, El Salvador, and Honduras well exceed it in deadly violence.