According to the Federal Bureau of Investigations 2015 Uniform Crime Report, Indianapolis ranks as the 16th most dangerous city in the U.S., with 17.1 homicides per 100,000 people, compared with the U.S. rate of 4.9 homicides per 100,000 people. Between 2012 and 2014, the murder rate rose by 44%. There were 138 homicides in 2014, with 60% of victims and 90% of perpetrators being young black men. With 144 criminal homicides, 2015 surpassed 1998 as the year with the most murder investigations in the city. With 154 criminal homicides, 2017 marked the third consecutive year of record violence. FBI data showed a 7 percent increase in violent crimes committed in Indianapolis, outpacing the rest of the state and country. Law enforcement has blamed increased violence on a combination of root causes, including poverty, substance abuse, mental illness, and availability of firearms.

Based on the above article, answer a question. How many more homicides per 100,000 people did Indianapolis have than the national average?
12.2