I don't have the numbers for 2017, but in 2016, there were 17,250 murders and non-negligent homicides in the USA alone, which works out to about 5 per 100,000 people. World-wide, the rate varies from 0.00 per 100,000 (Andorra, Liechtenstein, Monaco, etc) to over a hundred per 100,000 (El Salvador had 6656 in 2015, working out to 108.64 her hundred thousand people). So for starters, if every murder were published, there would be no time (TV) or room (print) to report anything else.
On top of that, if you're in the US, then yes, there absolutely IS a bias against reporting any but the biggest news if it occurred outside the US and doesn't impact the nation directly. The news is a reflection of what people want to see, and the American public at large doesn't care about murders in Mexico unless they involve Americans. Blame, if you will, nearly 40 years of demonizing Mexicans as barbarians who kill and ra** at will (our president sure does!), or blame the abundance of stories of drug-related killings, especially from the 80's and 90's. Overall, though, Americas are not particularly interested in foreign news of ANY sort unless it affects them, whether it be 14 people murdered in Cancun or the constant sniping of Gaza protesters by Israeli soldiers, which ALSO gets no major coverage. (The only reason that's in the news at ALL right now was someone videotaped an occurrence and put it online.)
Basically, the only exceptions are those killings we consider 'unacceptable' - mass graves and genocide in Africa get completely ignored, but the death of a hundred or so to poison gas makes front page news. (Also, note that Syria has quite the history of this, most of which goes unreported; there are 34 confirmed poison gas attacks by Syria since 2013.)
This really isn't anything new; the idea of America taking a world leadership role in ANYTHING really only took root after World War II.