Year	sq. km
1990	25067.2
1991	25166.48
1992	25265.76
1993	25365.04
1994	25464.32
1995	25563.6
1996	25662.88
1997	25762.16
1998	25861.44
1999	25960.72
2000	26060
2001	26159.29
2002	26258.58
2003	26357.87
2004	26457.16
2005	26556.45
2006	26655.74
2007	26755.03
2008	26854.32
2009	26953.61
2010	27052.9
2011	27072.68
2012	27092.46
2013	27112.24
2014	27132.02
2015	27151.8
2016	27171.6
2017	27191.4
2018	27211.2
2019	27231
2020	27250.8
2021	27270.6