The United Nations Office of Drugs & Crime just released its 2013 report on global homicide statistics. The report is 166 pages of statistics and charts breaking down everything from murder rates by country (per capita), type of weapon/instrument, yearly change, etc.
The Americas (North, Central, & South) have now surpassed Africa homicide rates in certain categories. The Honduras had one of the highest murder rates and Lichtenstein had the lowest (with zero murders in 2012). Asia showed relatively low suspect conviction rates.
The report is eye-opening in many respects and probably contains more information than the average person ever wanted to know about global murder statistics.