question: How many years after the head of the diocese has been Metropolitan Panteleimon did it change to Metropolitan Elia?
#1 return the  head of the diocese has been Metropolitan Panteleimon 
#2 return the  head of the diocese did change to Metropolitan Elia 
#3 return year of #1 
#4 return year of #2 
#5 return difference of #3 and  #4