Sum and lookup

Hello, I need a little of help

I need to sum the value of a colum for every pack of years. The problem is that in some cases I got 28 rows for a year and in other cases more or less..So I suppose that the formula should sum when the year changes, but I dont know how to do this...

I have attached an example (the original has like 50000 rows)

Your help would be greatly appreciated!!

Hi

For example in I2

=SUMPRODUCT(--(A2:A56=L2)*(B2:B56=G2),(D2:D56))

Will give Argentina and 1980 total

Ed

Thanks a lot!!, It worked very well!

You're welcome.

thanks for the feedback

Ed