Year	sq. km
1990	206185
1991	205257.85
1992	204330.7
1993	203403.55
1994	202476.4
1995	201549.25
1996	200622.1
1997	199694.95
1998	198767.8
1999	197840.65
2000	196913.5
2001	196169.8
2002	195426.1
2003	194682.4
2004	193938.7
2005	193195
2006	192451.3
2007	191707.6
2008	190963.9
2009	190220.2
2010	189476.5
2011	190509.64
2012	191542.78
2013	192575.92
2014	193609.06
2015	194642.2
2016	193146.4
2017	192644.9
2018	192143.4
2019	191641.9
2020	191140.4
2021	190638.9