Report Viewer - How do I get Report Viewer to display only the last value for a variable

Hi! I'm trying to make a Report Viewer Screen to show only the last value for a variable, I have already configured archive and report, but if I make the report only show 1 entry it always shows the oldest value. How can I make that entry to be the last value instead?

In the next images I show the values from the variables and the resulting report. (The variables and values are a simulation)