Summarized ColumnTable adding a Column to this table from another Summarised Table.

Good Afternoon,

I Have Table 1 which is a summarised version of a larger fact table..  Has Year, Fin Month, Various Columns and a Value.

I Have a 2nd Table, which too is a summarised table of a larger fact table.  Also Has Year, Fin Month and 1 Value.

I would like to Add Table2's Value Column, to Table 1.

End result required

I will be Combining Year and Fin Month to get a singular ID Field  to get a relationship... Just Cannot seem to get the required Output...

Any help will be most appreciated.

Regards Mike.