I guess my first recommendation would be to make the PK a nonclustered index. It's currently way too wide to be of any practical use as a clustered index and will cause BTree of the index on quotetype column to bloat quite badly (remember that all the columns of a clustered index are added to all nonclustered indexes) making it read many more pages per lookup than it should need to. I would put a new clustered index on year and week because that seems to be predominate in all of your queries.