Year	Cubic Meters
1990	6388000
1991	6388000
1992	6428000
1993	6428000
1994	6479000
1995	5377000
1996	5798000
1997	7415000
1998	7526000
1999	7836000
2000	5400000
2001	5495000
2002	5495000
2003	5495000
2004	5495000
2005	5495000
2006	5495000
2007	5495000
2008	6211000
2009	6211930
2010	6211930
2011	6211930