Year	sq. km
1990	1611.1
1991	1621.6
1992	1632.1
1993	1642.6
1994	1653.1
1995	1663.6
1996	1674.1
1997	1684.6
1998	1695.1
1999	1705.6
2000	1716.1
2001	1717.33
2002	1718.56
2003	1719.79
2004	1721.02
2005	1722.25
2006	1723.48
2007	1724.71
2008	1725.94
2009	1727.17
2010	1728.4
2011	1728.14
2012	1727.88
2013	1727.62
2014	1727.36
2015	1727.1
2016	1726.1
2017	1725.9
2018	1725.7
2019	1725.5
2020	1725.3
2021	1725.1