Year	sq. km
1990	188037
1991	186854
1992	185671
1993	184488
1994	183305
1995	182122
1996	180939
1997	179756
1998	178573
1999	177390
2000	176207
2001	175024
2002	173841
2003	172658
2004	171475
2005	170292
2006	169109
2007	167926
2008	166743
2009	165560
2010	164377
2011	163194
2012	162011
2013	160828
2014	159645
2015	158462
2016	157279
2017	156096
2018	154913
2019	153730
2020	152547
2021	151364