Year	sq. km
1992	3343.12
1993	3341.03
1994	3338.94
1995	3336.85
1996	3334.76
1997	3332.67
1998	3330.58
1999	3328.49
2000	3326.4
2001	3324.32
2002	3322.24
2003	3320.16
2004	3318.08
2005	3316
2006	3313.92
2007	3311.84
2008	3309.76
2009	3307.68
2010	3305.6
2011	3303.52
2012	3301.44
2013	3299.36
2014	3297.28
2015	3295.2
2016	3293.1
2017	3291
2018	3288.9
2019	3286.8
2020	3284.7
2021	3282.6