Sum values based on selected countries

[Kunkulis]

Hello,

I have selected 3 countries:

• Denmark (0.05)
• Sweden (0.1)
• Germany(0.5)

The numbers in brackets are the ones I want to Sum, but I keep getting 0
Also, please keep in mind, that there are way more countries in the app, so the SUM has to be dynamic and change on the selections.

Currently I am trying this formula, which seems correct, but, as I said, I keep getting a 0

=Sum({<Country={'$(=Country)'},Year={'$(=Year)'}>}Number)

I tried 

=Sum({<Country>}Number)

Which did work, but it gave me (what I assume) was the whole sum

Thank you in advance

[Steven_Haught]

@Kunkulis 

Any chance you can share a sample of the data? I also assume that the country and Year in the $ Expansion are variables? What are the calculations for those?