The answer is zero.
Every single TV station in China is run by the state and is allowed to only telecast pre-approved and sanitized programmes, films and content.
To give you an idea about what is censored, they have recently asked episodes of a long-running children's cartoon called 'Pleasant Goat and the Big Big Wolf' to be censored because of violence.
Freedom of speech and seems to be so severely curbed for the Chinese people. One the one hand it is becoming an economic superpower and on the other hand it is inside an impregnable shell that does not allow the Chinese people truly integrate with the rest of the world.
Time for some change I feel. When it will happen, can only be answered by Mr. Wen!