partition over weeks sql 2005

I have in table two columns with dates. One date represent expected date and other one date when job is finished. I want to make query to get how many jobs were finished including specific week in current year and how many jobs should be finished to that week.

So if I transform my dates in weeks in those two colums as:

wkx:7,7,7,8,8,9,10,10,10,10,11,11
wkf:7,8,10,10,12,13,14,15,16,17,18,19 

response should be smth like:

wk:7,8,9,10,11,12,13,14,15,16,17,18,19
numx:3,5,6,10,12,12,12,12,12,12,12,12,12
numf:1,2,2,4,4,5,6,7,8,9,10,11,12

I am using MS SQL 2005, and have no idea even how to get distinct weeks in one column as is in example. regards