Year	sq. km
1990	49867.9
1991	49392.37
1992	48916.84
1993	48441.31
1994	47965.78
1995	47490.25
1996	47014.72
1997	46539.19
1998	46063.66
1999	45588.13
2000	45112.6
2001	44695.07
2002	44277.54
2003	43860.01
2004	43442.48
2005	43024.95
2006	42607.42
2007	42189.89
2008	41772.36
2009	41354.83
2010	40937.3
2011	40615.04
2012	40292.78
2013	39970.52
2014	39648.26
2015	39326
2016	38682.4
2017	38499.2
2018	38085.8
2019	37672.4
2020	37259
2021	36845.6