How many years after the head of the diocese has been Metropolitan Panteleimon did it change to Metropolitan Elia?
return the  head of the diocese has been Metropolitan Panteleimon ;return the  head of the diocese did change to Metropolitan Elia ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']