Year	sq. km
1990	4760.4
1991	4706
1992	4651.6
1993	4597.2
1994	4542.8
1995	4488.4
1996	4434
1997	4379.6
1998	4325.2
1999	4270.8
2000	4216.4
2001	4162
2002	4107.6
2003	4053.2
2004	3998.8
2005	3944.4
2006	3890
2007	3835.6
2008	3781.2
2009	3726.8
2010	3672.4
2011	3618
2012	3563.6
2013	3509.2
2014	3454.8
2015	3400.4
2016	3346
2017	3292
2018	3237
2019	3183
2020	3128
2021	3073.667