question: Was the GDP of Berlin higher or lower in 2015 than it was in 2014?
#1 return Berlin 
#2 return GDP of #1 
#3 return #2 in  2015 
#4 return #2 in  2014 
#5 return if #3 is higher than #4 
#6 return if #3 is lower than #4 
#7 return which is true of #5 ,  #6