Year	sq. km
1990	4146.6
1991	4089.27
1992	4031.94
1993	3974.61
1994	3917.28
1995	3859.95
1996	3802.62
1997	3745.29
1998	3687.96
1999	3630.63
2000	3573.3
2001	3515.97
2002	3458.64
2003	3401.31
2004	3343.98
2005	3286.65
2006	3229.32
2007	3171.99
2008	3114.66
2009	3057.33
2010	3000
2011	2942.68
2012	2885.36
2013	2828.04
2014	2770.72
2015	2713.4
2016	2656
2017	2598.7
2018	2541.4
2019	2484
2020	2426.7
2021	2369.333