When was Suzhou Metro Phase 3.5 reported?

20 17 report of Suzhou metro phase 3.5. According to relevant information, in 20 17, the National Development and Reform Commission approved the third phase planning of Suzhou Metro. This time, it approved the third phase adjustment plan, which is called the 3.5-phase subway. In the 3.5-phase subway, there are three subway extension lines with a total length of only 20 kilometers and a total investment of 654.38+0.29 billion yuan.