Year	sq. km
1990	223150
1991	223030
1992	222910
1993	222790
1994	222670
1995	222550
1996	222430
1997	222310
1998	222190
1999	222070
2000	221950
2001	221830
2002	221710
2003	221590
2004	221470
2005	221350
2006	221230
2007	221110
2008	220990
2009	220870
2010	220750
2011	220630
2012	220510
2013	220390
2014	220270
2015	220150
2016	220030
2017	219910
2018	219760
2019	219610
2020	219460
2021	219310