Year	Cubic Meters
1990	20023000
1991	19403000
1992	23186000
1993	22532000
1994	22893000
1995	23356000
1996	22814000
1997	24646000
1998	25741000
1999	26685000
2000	28271000
2001	27227000
2002	29552000
2003	31501000
2004	33464000
2005	32718000
2006	33136000
2007	36703000
2008	35126000
2009	35561000
2010	36550000
2011	38333000