Year	cubic meters
1961	21070.145036195976
1962	20194.434394128046
1963	19694.974260896113
1964	19202.73399563042
1965	18717.12681864278
1966	18240.26010406391
1967	17768.62043459397
1968	17304.4591258911
1969	16855.809966292418
1970	16436.820908017922
1971	16077.199746450291
1972	15719.734773522698
1973	15329.518798011497
1974	14947.218381597471
1975	14587.889408844694
1976	14253.740261237279
1977	13917.829812555075
1978	13563.17999227047
1979	13205.862019017932
1980	12886.87326727316
1981	12615.097297064216
1982	12326.91203770383
1983	12006.141800051533
1984	11686.739973067413
1985	11382.281535334889
1986	11096.785110112543
1987	10824.260521142147
1988	10563.620972933362
1989	10307.909572354774
1990	10064.961714789759
1991	9837.102805132725
1992	9617.932726828467
1993	8697.46846926301
1994	8452.64237667222
1995	8245.414801817882
1996	8046.2627465574205
1997	7857.386027742715
1998	7673.183157589254
1999	7492.28951279726
2000	7321.273276428841
2001	7153.842570659707
2002	6978.7386226711305
2003	6807.1002606976635
2004	6643.521856371368
2005	6489.553273289195
2006	6338.814148600364
2007	6194.421263359219
2008	6058.836351822304
2009	5926.961721157074
2010	5794.962485725768
2011	5664.095239191248
2012	5310.089091103051
2013	5196.346715521189
2014	5086.133730251951
2015	4976.256520437334
2016	4864.52495254512
2017	4753.757485560478
2018	4645.428672332222
2019	4538.451723695363
2020	4433.538219346347