Year	sq. km
2000	1280
2001	1280
2002	1280
2003	1280
2004	1280
2005	1290
2006	1290
2007	1310
2008	1310
2009	1307
2010	1310.4
2011	1312.7
2012	1314.2
2013	1308.8
2014	1309.9
2015	1312.7
2016	1306.51
2017	1311.58
2018	1315.59
2019	1315.92
2020	1321.36
2021	1328.11