| | 1997.07 — 2000.02 | | 2000.02 — 2001.11 | | 2001.11 — 2003.03 | | 2003.03 — 2007.12 | | 2007.12 — 2010.09 | | 2010.09 — 2012.12 | | | 2012.12 — 2016.01 | | | 2016.01 — 2016.05 | | | | 2016.05 — 2017.11 | | | 2017.11 — 2018.06 | | 2018.6 — | | | | | |