The article mentions that, as in years before, the Chinese tighten censorship when important party meetings or other events of political significance come up. B

The article mentions that, as in years before, the Chinese tighten censorship when important party meetings or other events of political significance come up. But does anyone know if the longer term trend is toward more isolation of the Chinese internet (or intranet, almost) or did the overall level of censorship stay constant over the last few years?