Year	Cubic Meters
1990	15756000
1991	15252000
1992	16953000
1993	18877000
1994	16845000
1995	19279000
1996	19411000
1997	18050000
1998	17668000
1999	16608300
2000	15939300
2001	15337200
2002	16122000
2003	15810000
2004	16503000
2005	16185000
2006	18084000
2007	18319000
2008	19420000
2009	19300000
2010	20554000
2011	21039000