Is it an uptick? Ausländer were 11.2% of the population in 2016 when the proportion of crimes was about the same (40%). 50% more Ausländer, the same amount of crime => the rate is clearly going down.
I chose 2016 because the rates were the same, but you can do the same analysis for 2017. The population of Ausländer has increased by more than their share of the crime rate.
Is it an uptick? Ausländer were 11.2% of the population in 2016 when the proportion of crimes was about the same (40%). 50% more Ausländer, the same amount of crime => the rate is clearly going down.
I chose 2016 because the rates were the same, but you can do the same analysis for 2017. The population of Ausländer has increased by more than their share of the crime rate.