Year	sq. km
1990	3170
1991	3140
1992	3110
1993	3080
1994	3050
1995	3020
1996	2990
1997	2960
1998	2930
1999	2900
2000	2870
2001	2848
2002	2826
2003	2804
2004	2782
2005	2760
2006	2738
2007	2716
2008	2694
2009	2672
2010	2650
2011	2660
2012	2670
2013	2680
2014	2690
2015	2700
2016	2720
2017	2730
2018	2740
2019	2750
2020	2760
2021	2770