What are the release dates for Frontline - 1983 Who's Afraid of Ai Weiwei - 29.7?

What are the release dates for Frontline - 1983 Who's Afraid of Ai Weiwei - 29.7?
Frontline - 1983 Who's Afraid of Ai Weiwei - 29.7 was released on:

USA: 29 March 2011