Year	Cubic Meters
1990	20513200
1991	20909100
1992	21701600
1993	22009800
1994	22294300
1995	22608100
1996	22802700
1997	22943400
1998	22958100
1999	23051200
2000	23100600
2001	23264500
2002	23438800
2003	23623600
2004	23819200
2005	24025900
2006	24228000
2007	24441200
2008	24665700
2009	24901800
2010	25149700
2011	25149700