Year	sq. km
1990	186021.5
1991	185983.57
1992	185945.64
1993	185907.71
1994	185869.78
1995	185831.85
1996	185793.92
1997	185755.99
1998	185718.06
1999	185680.13
2000	185642.2
2001	185597.79
2002	185553.38
2003	185508.97
2004	185464.56
2005	185420.15
2006	185375.74
2007	185331.33
2008	185286.92
2009	185242.51
2010	185198.1
2011	185081.2
2012	184964.3
2013	184847.4
2014	184730.5
2015	184613.6
2016	184521.6
2017	184429.5
2018	184337.5
2019	184245.4
2020	184153.4
2021	184061.333