Year	Cubic Meters
1990	20104940
1991	18859080
1992	18164090
1993	17686740
1994	17547960
1995	17173280
1996	16999070
1997	16660310
1998	16654140
1999	16689800
2000	16693710
2001	16263700
2002	16017080
2003	15987500
2004	16129590
2005	16079030
2006	16127030
2007	15868000
2008	16392700
2009	16266720
2010	15914940
2011	16117440