Year	cubic meters
1961	6906.3651681045
1962	6865.340953546144
1963	6839.92511461297
1964	6815.167602009253
1965	6783.361536913241
1966	6733.497793212193
1967	6678.882111742764
1968	6635.574803807218
1969	6611.371285036278
1970	6596.301567440473
1971	6567.745845447806
1972	6525.191514370947
1973	6495.625644102879
1974	6471.753807343923
1975	6411.290237893135
1976	6312.478572944499
1977	6230.87832072243
1978	6150.609986745435
1979	6074.406451941286
1980	6015.034474962677
1981	5961.343769110989
1982	5924.707388406348
1983	5890.341941458735
1984	5861.0717818598005
1985	5838.358012139758
1986	5819.079014364396
1987	5799.654920532229
1988	5778.6288967511455
1989	5748.551612775977
1990	5688.0634615279
1991	5620.194794013562
1992	5577.426654195028
1993	5544.713092166993
1994	5517.019911305344
1995	5491.304661085671
1996	5467.159339416334
1997	5440.258040818631
1998	5410.190878063719
1999	5389.484075840077
2000	5367.483856829586
2001	5339.651552752259
2002	5320.114011877797
2003	5307.4330600005305
2004	5294.317982762613
2005	5278.815186313962
2006	5262.98500902239
2007	5249.594219943336
2008	5235.677240718656
2009	5221.924122381374
2010	5215.1984189676405
2011	5222.920082388863
2012	5251.239677352969
2013	5289.455898295071
2014	5324.807276404228
2015	5360.006202820971
2016	5382.34559094489
2017	5393.001501950918
2018	5403.953942659577
2019	5409.649434197304
2020	5421.2705794468975