Year	sq. km
1990	1397
1991	1395.48
1992	1393.96
1993	1392.44
1994	1390.92
1995	1389.4
1996	1387.88
1997	1386.36
1998	1384.84
1999	1383.32
2000	1381.8
2001	1380.97
2002	1380.14
2003	1379.31
2004	1378.48
2005	1377.65
2006	1376.82
2007	1375.99
2008	1375.16
2009	1374.33
2010	1373.5
2011	1379.46
2012	1385.42
2013	1391.38
2014	1397.34
2015	1403.3
2016	1409.3
2017	1415.3
2018	1421.3
2019	1427.3
2020	1433.3
2021	1439.3