Year	Cubic Meters
1990	21130
1991	23950
1992	16650
1993	14060
1994	6240
1995	5550
1996	5540
1997	5810
1998	6720
1999	14160
2000	14900
2001	15260
2002	15640
2003	16030
2004	16420
2005	16830
2006	17130
2007	17440
2008	17760
2009	18080
2010	18410
2011	18680