Year	sq. km
1990	3482729.3
1991	3482258.34
1992	3481787.38
1993	3481316.42
1994	3480845.46
1995	3480374.5
1996	3479903.54
1997	3479432.58
1998	3478961.62
1999	3478490.66
2000	3478019.7
2001	3477539.94
2002	3477060.18
2003	3476580.42
2004	3476100.66
2005	3475620.9
2006	3475141.14
2007	3474661.38
2008	3474181.62
2009	3473701.86
2010	3473222.1
2011	3472809.1
2012	3472396.1
2013	3471983.1
2014	3471570.1
2015	3471157.1
2016	3470760.4
2017	3470390.5
2018	3470020.7
2019	3469650.8
2020	3469281
2021	3468911.133