Year	sq. km
1990	19450
1991	18833.1
1992	18216.2
1993	17599.3
1994	16982.4
1995	16365.5
1996	15748.6
1997	15131.7
1998	14514.8
1999	13897.9
2000	13281
2001	13156.8
2002	13032.6
2003	12908.4
2004	12784.2
2005	12660
2006	12535.8
2007	12411.6
2008	12287.4
2009	12163.2
2010	12039
2011	11914.8
2012	11790.6
2013	11666.4
2014	11542.2
2015	11418
2016	11293.8
2017	11169.6
2018	11045.4
2019	10921.2
2020	10797
2021	10672.8