In any case, there seem to be two options:
a) Export it as a Cross-tab, where the last column provides the current received Merit values for the most recent day each column corresponds to a single day, being the data presented in a cumulative fashion.
b) Force the focus on the item that you want to export the data from. For example, if you want to export all the data from the graph, what I did click on a data point in any of the lines (it delimits the selection to that line), and then click it again to deselect the prior selection. After doing so, the page’s focus will be on the desired graph, and the Data option becomes available as an export option.