Task: Question Decomposition
Input (English): question: How many more criminal homicides were there in 2017 compared to 2015?
Output (English): #1 return criminal homicides 
#2 return #1 in  2017 
#3 return #1 in  2015 
#4 return number of  #2 
#5 return number of  #3 
#6 return difference of #4 and  #5