For a record list Results Table, or an aggregated table without summary rows, you can sort the table using any of the displayed columns. You can also create a compound sort, where the table is sorted by multiple columns in order.
So for example, you could set up a compound sort to sort by Country, then by Year. So all of the records for the United States would be grouped together, with those records then sorted by Year.
To set the sorting for a table: