Using Button States to Create a Status Bar

I'm looking for advice from more experienced Storyline Users. I am creating a Musketeer sim project with three stats:  Diplomacy, Courage and Dexterity. I created a button with 11 states:

• Empty Bar
• Filled at 1-10 levels

How can I efficiently animate the bar by switching states to match the variable? It seems like each slide will need many triggers (3 x 10). But I think I might be missing something. I've included some of the graphics so you can see.