Sum Values Against Part Of A Date, Year

Basically, each date, in the format mmm yy, has a cost, two cells right of the date. I want to create year sub totals at the bottom of the cost column by looking up the year element of the date....so in my own wierd logic, I want to ask, if in the range of cells C5 to C22, contains the year 10, add the cost in column E to the total cell (E27).....this is probably laughably simple to you guys, but when you dont know the correct term for the action, it is a swine to find.