Your statistics do not differentiate gun homicides from any other form of murder which according to the law is a pretty broad category including unintentional killings such as death from a well placed punch, drunk driving or being an accomplice.
Most have come from guns.
There were 9,616 reported homicides committed with firearms in 2015.
Expanded Homicide Data Table 8
The total number of reported homicides by weapon was 13,455, or 85.7% of the total 15,696 homicides. The normalized number of homicides committed by firearms is thus 11,218.
13,455 / 85.7% = 11,218
The total population of the United States was 323,127,513.
American FactFinder - Results
Thus the murder rate by firearms was 3.47.
11,218 / 323,127,513 X 100,000 = 3.47.
59% of 3.47 is 2.04. The rate of gun homicides perpetrated by blacks.
3.47 - 2.04 = 1.43 the rate of gun homicides perpetrated by "whites" (including hispanics)
Which is still 50% higher than in Europe.