Year	Cubic Meters
1990	11900
1991	11900
1992	12800
1993	11800
1994	12000
1995	12000
1996	12000
1997	12000
1998	12000
1999	12000
2000	12000
2001	14470
2002	14710
2003	12920
2004	13180
2005	13040
2006	12830
2007	12140
2008	12410
2009	12410
2010	12410
2011	12410