The murder rate in 2015 was just 4.9 per 100,000 people. That figure is dwarfed by crime figures in the 1990s when the murder rates in the 1980s and 1990s when the murder rate hovered between 8 and 10 murders per 100,000 people.
http://www.ktnv.com/news/national/trump-falsely-claims-us-murder-rate-is-highest-in-47-years