The central stastic government will release the GDP data, include all the provinces, from 2005. It will especially focus on the index of investment, agriculture and price. (link in Chinese)
The number of GDP in China has been a great benchmark these years, though not many outsiders enquiries its validity. Part of the reason is due to the fault or error in the provincial statistics. Fortunately, they have paid attention to it.
But the question is how much money and human resource can they spend to detailedly record the national statistics?