Year	cubic meters
1961	426.6894234359166
1962	433.18171973142734
1963	441.249471419904
1964	450.66190967984227
1965	461.39649338665026
1966	473.5315589053529
1967	487.12171953967
1968	502.3863350916855
1969	520.2124200715292
1970	533.7128624799858
1971	538.3217818450979
1972	540.3458213256484
1973	542.4709552009404
1974	544.7612130016344
1975	546.8465184104995
1976	548.6968449931413
1977	550.4208426025733
1978	552.1684113654665
1979	554.5542769998614
1980	556.8833097431376
1981	558.7502619141852
1982	560.8262840585129
1983	563.3802816901409
1984	566.3048607833884
1985	569.4760820045558
1986	572.9427773401131
1987	576.6874113943821
1988	580.8184700273468
1989	585.480093676815
1990	590.6093119401517
1991	591.9786887672044
1992	586.79706601467
1993	579.0527661833185
1994	571.414966310326
1995	564.0423031727379
1996	556.8833097431376
1997	549.7526113249038
1998	542.6181324892607
1999	535.4155047406581
2000	527.9250346450804
2001	521.8979689470709
2002	518.7618882932735
2003	516.896039284099
2004	515.2425933877201
2005	513.6436597110755
2006	512.0109228996885
2007	510.4753801978093
2008	508.949020273136
2009	507.54980332445126
2010	506.29706980570853
2011	504.40301801139117
2012	502.86001634295053
2013	502.43892226851176
2014	502.20762100064866
2015	502.19711236660396
2016	502.21813007449566
2017	502.24965993512615
2018	502.50204141454327
2019	503.0181086519115
2020	503.75718903488524