Jelaskan Sejarah dari Distrik Yeonsu

March 1, 1995: Yeonsu-gu annexes part of Nam-gu; sub-division of Yeonsu-1-dong into Yeonsu-1-dong and Yeonsu-3-dong, and Dongchun-dong into Dongchun-1-dong and Dongchun-2-dong.

January 1, 1996: Sub-division of Dongchun-2-dong into Dongchun-2-dong and Cheonyang-dong.

March 1, 2003: Sub-division of Okyeon-dong into Okyeon-1-dong and Okyeon-2-dong.

December 19, 2003: Cheongnyang-dong absorbed into Donchun-3-dong.

March 6, 2006: Establishment of Songdo-dong administrative division, placed under jurisdiction of Dongchun-2-dong.

January 1, 2007: Sub-division of Donchun-2-dong into Dongchun-2-dong and Songdo-dong.

January 1, 2012: Sub-division of Songdo-dong into Songdo-1-dong and Songdo-2-dong.