Year	sq. km
1990	47812
1991	47240
1992	46668
1993	46096
1994	45524
1995	44952
1996	44380
1997	43808
1998	43236
1999	42664
2000	42092
2001	41605.4
2002	41118.8
2003	40632.2
2004	40145.6
2005	39659
2006	39172.4
2007	38685.8
2008	38199.2
2009	37712.6
2010	37226
2011	36952.4
2012	36678.8
2013	36405.2
2014	36131.6
2015	35858
2016	35742
2017	35626
2018	35510
2019	35394
2020	35278
2021	35162