Year	sq. km
1990	3523832.0999999996
1991	3507104.8240000005
1992	3490377.548
1993	3473650.2720000003
1994	3456922.996
1995	3440195.72
1996	3423468.4439999997
1997	3406741.1679999996
1998	3390013.892
1999	3373286.616
2000	3356559.34
2001	3340445.426
2002	3324331.5120000006
2003	3308217.598
2004	3292103.6840000004
2005	3275989.77
2006	3259875.8559999997
2007	3243761.9420000003
2008	3227648.0280000004
2009	3211534.1140000005
2010	3195420.1999999997
2011	3175259.36
2012	3155098.5199999996
2013	3134937.68
2014	3114776.84
2015	3094616
2016	3073376.1999999997
2017	3052952.5
2018	3032941.28
2019	3012203.7
2020	2991863.4000000004
2021	2971258.2460000003