question: How many less people were in the peninsula during the first census compared to the pre-war population?
#1 return people 
#2 return #1 that were in  the  peninsula 
#3 return #2 during the  first census 
#4 return number of  #3 
#5 return #1 in  the  pre-war population 
#6 return number of  #5 
#7 return difference of #6 and  #4