Year	cubic meters
1961	18774.789816572364
1962	18323.298720428753
1963	17877.392539350956
1964	17436.742900944457
1965	17001.956754648967
1966	16574.81129319977
1967	16156.00008642619
1968	15743.519817775528
1969	15337.909589863586
1970	14938.649162547756
1971	14548.46766573926
1972	14170.317198704877
1973	13794.363158086786
1974	13417.075711252415
1975	13044.97752040706
1976	12684.65952563551
1977	12331.673133471628
1978	11971.214542787377
1979	11606.776273069609
1980	11256.86160662658
1981	10936.14227942629
1982	10628.231592289658
1983	10329.231478470745
1984	10040.889195657852
1985	9754.507375065426
1986	9474.504465593574
1987	9202.64857217008
1988	8945.261937616488
1989	8697.80257691039
1990	8461.633426156994
1991	8243.548931045907
1992	8033.798753821763
1993	7241.730613666719
1994	7055.928999608363
1995	6873.613345548053
1996	6692.73599800135
1997	6521.36165053709
1998	6355.240126119795
1999	6192.5858343054615
2000	6033.5862512576
2001	5876.973057589355
2002	5723.23772041102
2003	5572.873829652115
2004	5425.420305988214
2005	5281.3487781992335
2006	5140.658451805636
2007	5002.77126449361
2008	4867.908734061237
2009	4736.555367599906
2010	4608.365687555549
2011	4483.55712776403
2012	4179.501030061813
2013	4066.7366883006744
2014	3957.3065569923706
2015	3850.624909417001
2016	3748.582207459166
2017	3650.873835387823
2018	3555.557411769206
2019	3463.1557969291052
2020	3373.652528449878