Year	Cubic Meters
1990	3743890
1991	4683000
1992	3826160
1993	3868590
1994	3910310
1995	4724000
1996	4330000
1997	5185000
1998	5129000
1999	5170000
2000	5200020
2001	5200130
2002	5200240
2003	4829080
2004	4854610
2005	4880520
2006	4886200
2007	4892100
2008	4898700
2009	4904560
2010	4907390
2011	4898530