Sharepoint 2010 - 100% Stacked Column - Hide 0 Values

Hi! I'm not an advanced user or a developer, but I maintain a Sharepoint site for my team in company I work for. And I have created a 100% Stacked Column chart. My problem is: I need to hide values when they are 0 (zero). Is it possible? Besides, how can I show the values with % sign at the end (like 82.3%).

Thanks!

Gustavo