Well, that's pretty meaningless, IMO. Pure and honest statistics are difficult to come by in some countries, such as economic issues in Argentina, or crime (including homicide) or health stats in Mexico. "Big" homicides, kidnaps, etc. hit the papers (which are controlled by the government in many ways, from licensure of journalists to the government agency that is the sole importer and distributor of newsprint t outright intimidation and homicide of journos who do not toe somebody's line, whether crooked pol or drug lord) - but much of what happens in an impacted barrio may never make it because it's not "newsworthy" or because much of the evidence is buried, and many of those impacted would never dare reporting incidents.

For example, my brother in law had his engineering offices invaded by armed thugs who cleaned out all valuables and cash, and was made to write checks on the company account. He was also told any attempt to put stops on the checks or report to officials would result in attacks on his family, and they proved they knew where he lived and some of the details of his three children's schools, etc. (Note: this would not apply to visitors - he was a resident; I am merely illustrating how there is in fact a paucity of actual data because much is not reported.)

Or, when the regular outbreaks of cholera (or violence) occurred in small villages south of Acapulco, the information was suppressed, lest it hurt tourism to Acapulco.

So, though I lived in Mexico and visit regularly, I do take precautions and would not advocate for glossing over the genuine problems that exist. In the D. F. I would not take pirate taxicabs, for example, because though the risk may not be super high, it is there and it far exceeds the risk of taking a taxi from an established taxi rank or one called by your hotel, restaurant or host. Use ATMs in very public places, preferably bank vestibules during working hours. Get local knowledge as to whether an area is secure at night, etc.

These days, I would be careful of large crowds - the Party of the Democratic Revolution (PRD, left) Andrés Manuel López Obrador ("AMLO") lost the election, the seven person Federal Elections Tribunal unanimously ruled last Friday Institutional Revolutionary Party (PRI, center-left) candidate Enrique Peña Nieto won the election 38% to 31%, a margin of over 3 million votes. Small groups of protesters shut down highway toll booths and created other minor disturbances, but AMLO has called for major protests, beginning with a call to action in the Zócalo 9 September.

Six years ago, when AMLO lost to the National Action Party's (PAN, center right) Felipe de Jesús Calderón Hinojosa by a narrower margin, protests blocked intersections, established blockades and caused damage, etc. for months. This year, he says the PRD protesters will obey the laws, but I do not believe he has full control over them and his speech incites: "I am telling the people of Mexico that I cannot accept the judgment of the electoral tribunal that declared the presidential election valid. The elections were not clean, free and genuine. As a result, I will not recognize an illegitimate power that's emerged as a result of vote-buying and other grave violations of the constitution and the law." In some cases, violence occurred, sometimes among protesters, sometimes between protesters and those sent to enforce the laws.

So, in the D. F., avoid any large gatherings on Reforma or the Zócalo, and don't linger if groups start coalescing (flash mobs, etc.) Use common sense, be situationally aware and remember tourist hit spots are thievery hot spots. If it comes down to giving up material stuff or risking your life or safety, give it up and move on. And don't expect law enforcement to take much of an interest in helping or solving anything, either; make your reports to your Embassy and to local tourist protection authorities.

Visit the U S Consular Affairs website Mexico information here. (Note: there are no travel advisories or warnings for Mexico City at this time.)

And, yes, two Americans being chased by bad guys on the Mexico - Cuernavaca road (not the toll road, AFAIK,) and got shot up by police at a roadblock - they were CIA agents in an uparmored Toyota Land Cruiser with U. S. diplomatic plates with an armed escort en route to a Navy base (yes, in the mountains, as the Naval Infantry, the U. S. Marines equivalent, are the prime anti-drug force in Mexico,) and most likely were targets; 12 police officers have been detained. So, avoid traveling to known "covert" bases in black SUVs with blacked out windows...