Year	Cubic Meters
1990	49600
1991	80800
1992	77660
1993	50400
1994	50400
1995	50400
1996	50400
1997	50400
1998	50400
1999	50400
2000	50400
2001	50400
2002	50400
2003	58100
2004	58100
2005	58100
2006	64350
2007	65200
2008	66100
2009	66960
2010	67890
2011	68050