Year	sq. km
1990	1506290
1991	1499560
1992	1492830
1993	1486100
1994	1479370
1995	1472640
1996	1465910
1997	1459180
1998	1452450
1999	1445720
2000	1438990
2001	1432260
2002	1425530
2003	1418800
2004	1412070
2005	1405340
2006	1398610
2007	1391880
2008	1385150
2009	1378420
2010	1371690
2011	1360676.24
2012	1349662.48
2013	1338648.72
2014	1327634.96
2015	1316621.2
2016	1305607.4
2017	1294593.7
2018	1283579.9
2019	1272566.1
2020	1261552.4
2021	1250538.633