Year	sq. km
1990	4567150.699999999
1991	4566345.785999999
1992	4564429.573
1993	4562513.358999999
1994	4560597.1450000005
1995	4558680.931
1996	4556764.718
1997	4554848.503999999
1998	4552932.29
1999	4551016.075999999
2000	4549099.862999999
2001	4568314.032
2002	4587528.200999999
2003	4606742.37
2004	4625956.539
2005	4645170.708
2006	4664384.876999999
2007	4683599.046
2008	4702813.215
2009	4722027.384000001
2010	4741241.552999999
2011	4747047.024
2012	4752852.495
2013	4758657.966
2014	4764463.437999999
2015	4770268.909
2016	4790821.77
2017	4791161.699999999
2018	4799041.899999999
2019	4806925
2020	4814808.2
2021	4822691.333