You had the right idea with using a Moving Average, but the default sample time (inherited, -1) for this block does not work. You have to set it to a positive number (discrete steps) or 0 (continuous). You might also have to set a Max step size in MODELING > Model Settings > Solver > Sover details.

Here is a moving average with Fundamental frequency 0.1 Hz and sample time 0:

note: you could also use a gain block instead of product to scale the output by 100.