Thank you Jayanta, selecting the Join_Count option did offer up Counts and Amounts (color), which is great.
However, it doesnt seem to be getting the actual data from the correct dataset, as all countries are colored the same (the dataset it should be reading off only has about 10 entries in the 'Country' field, most of them of different countries). The Country data is in a Repeat layer, but for this Join_Feature layer I selected the parent layer as it was the only way to perform the join with 'Choose a spatial relationship'. I am suspecting that the above issue might be caused by the data in the Repeat layer not being able to be read, and only the parent layer data being available?
I tried Join_Features with the Repeat layer, but when I perform this I am only able to select 'Choose the fields to match' - I found that this results in a Table Hosted Layer, which doesn't give me the 'Change Style' button at all. Any ideas would be greatly appreciated!