Task: Question Decomposition
Input (English): question: How many more digital screens worldwide in 2010 than in 2009?
Output (English): #1 return digital screens worldwide 
#2 return #1 in  2010 
#3 return #1 in  2009 
#4 return number of  #2 
#5 return number of  #3 
#6 return the  difference of #4 and  #5