Pulling data across sheets to a summary sheet

[Mistaree]

Hello,

My workbook has 100+ sheets and I am trying to pull three particular data points from each sheet to a summary sheet. The data points I am trying to pull from each sheet are located in the same cells on each sheet, e.g. Total 2015 is in cell G40, Total 2020 is in G41 and Total 2025 is in G42 in every single sheet. Now in my summary sheet Column E ('Countries) has the name of all my sheets, e.g. Sweden, Norway, Finland, and in Columns F, G and H, I would like to retrieve the Total 2015, Total 2020 and Total 2025 from each sheet. Is there a simple formula for this or should I create a macro? I have been Googling for two days and getting more confused, but it feels like there should be a pretty straightforward solution, or? Any help would be very much appreciated.

Here's a little illustration of what I am aiming for

Countries Total 2015 Total 2020 Total 2025
Sweden 150 200 250 --> These three data points pulled from cells G40-G42 in Sheet "Sweden"
Norway 100 150 175 --> These three data points pulled from cells G40-G42 in Sheet "Norway"

 

[VoG]

Take a look at INDIRECT http://www.contextures.com/xlFunctions05.html

 

[Mistaree]

Thank you very much!

A follow-up question would be if I can combine this with an IF function. In Coulumn E with all countries, I have countries entered that do not have a separate sheet. By using an IF function I'd like Excel to give me "n/a" for those entries where there is no underlying work sheet for that particular country.