Year	sq. km
1992	11970
1993	12015
1994	12060
1995	12105
1996	12150
1997	12195
1998	12240
1999	12285
2000	12330
2001	12344
2002	12358
2003	12372
2004	12386
2005	12400
2006	12414
2007	12428
2008	12442
2009	12456
2010	12470
2011	12472
2012	12474
2013	12476
2014	12478
2015	12480
2016	12459.7
2017	12439.3
2018	12419
2019	12398.6
2020	12378.3
2021	12357.933