The system has 9 lines in operation. Line 2 opened to the public on September 16, 2011.[2] Line 1 began operation on September 15, 2013. Line 3 began operation after months of delay on November 8, 2016. Line 4 opened on December 26, 2018. Lines 5, 6, 9 opened in December 2020. Line 14 opened in September 2019 and extended in June 2021. Line 16 opened on June 27, 2023.[3]