Year	sq. km
1990	139046.6
1991	142235.87
1992	145425.14
1993	148614.41
1994	151803.68
1995	154992.95
1996	158182.22
1997	161371.49
1998	164560.76
1999	167750.03
2000	170939.3
2001	172390.71
2002	173842.12
2003	175293.53
2004	176744.94
2005	178196.35
2006	179647.76
2007	181099.17
2008	182550.58
2009	184001.99
2010	185453.4
2011	185465.08
2012	185476.76
2013	185488.44
2014	185500.12
2015	185511.8
2016	185552.4
2017	185593
2018	185635.9
2019	185678.8
2020	185721.7
2021	185764.6