Year	sq. km
1990	7888
1991	7868.5
1992	7849
1993	7829.5
1994	7810
1995	7790.5
1996	7771
1997	7751.5
1998	7732
1999	7712.5
2000	7693
2001	7705.77
2002	7718.54
2003	7731.31
2004	7744.08
2005	7756.85
2006	7769.62
2007	7782.39
2008	7795.16
2009	7807.93
2010	7820.7
2011	7834.935
2012	7849.17
2013	7863.405
2014	7877.64
2015	7891.875
2016	7891.8
2017	7889.025
2018	7889
2019	7889
2020	7889
2021	7889