Year	sq. km
1990	1320
1991	1341
1992	1362
1993	1383
1994	1404
1995	1425
1996	1446
1997	1467
1998	1488
1999	1509
2000	1530
2001	1531
2002	1532
2003	1533
2004	1534
2005	1535
2006	1536
2007	1537
2008	1538
2009	1539
2010	1540
2011	1562
2012	1584
2013	1606
2014	1628
2015	1650
2016	1400
2017	1400
2018	1400
2019	1400
2020	1400
2021	1400