Year	sq. km
1990	5888980
1991	5851170.6
1992	5813361.2
1993	5775551.8
1994	5737742.4
1995	5699933
1996	5662123.6
1997	5624314.2
1998	5586504.8
1999	5548695.4
2000	5510886
2001	5471378.1
2002	5431870.2
2003	5392362.3
2004	5352854.4
2005	5313346.5
2006	5273838.6
2007	5234330.7
2008	5194822.8
2009	5155314.9
2010	5115807
2011	5100415.2
2012	5085023.4
2013	5069631.6
2014	5054239.8
2015	5038848
2016	5020821
2017	5000916
2018	4990514
2019	4977985
2020	4966196
2021	4953913.666999999