Year	sq. km
1992	3292
1993	3311
1994	3330
1995	3349
1996	3368
1997	3387
1998	3406
1999	3425
2000	3444
2001	3474.1
2002	3504.2
2003	3534.3
2004	3564.4
2005	3594.5
2006	3624.6
2007	3654.7
2008	3684.8
2009	3714.9
2010	3745
2011	3768.8
2012	3792.6
2013	3816.4
2014	3840.2
2015	3864
2016	3865
2017	3865
2018	3865
2019	3865
2020	3865
2021	3865