Year	Cubic Meters
1990	29734000
1991	28362000
1992	27537000
1993	25950000
1994	24813000
1995	23248000
1996	22803000
1997	21851000
1998	19597000
1999	19072000
2000	18255000
2001	16972000
2002	16267000
2003	16336000
2004	16724000
2005	17335000
2006	17765000
2007	18771000
2008	18877000
2009	17732000
2010	18391000
2011	19572000