A company is evaluating its data sharing policies to enhance collaboration while maintaining security. They have three different teams: Sales, Marketing, and Customer Support. Each team requires access to specific data sets, but there are concerns about sensitive information being exposed. The company decides to implement a role-based access control (RBAC) system. If the Sales team needs access to 70% of the data, Marketing requires 50%, and Customer Support needs access to 30%, what is the minimum percentage of data that must be shared across all teams to ensure that each team can perform its functions without compromising sensitive information?