Year	cubic meters
1961	58451.968301553214
1962	56791.182964316395
1963	55224.11821933375
1964	53709.15884175451
1965	52250.306761051506
1966	50855.22058366217
1967	49522.7224762402
1968	48248.7279055411
1969	47028.71731594194
1970	45858.23589017086
1971	44732.22739652586
1972	43644.292510133695
1973	42591.081569660615
1974	41573.64062609328
1975	40593.81163157531
1976	39649.91367461709
1977	38727.52765782029
1978	37824.47391974661
1979	36953.06926933971
1980	36121.72996221235
1981	35340.91640660447
1982	34594.08377164911
1983	33865.70663541755
1984	33164.52373335033
1985	32494.209835470854
1986	31853.671665566282
1987	31239.280127901642
1988	30645.155416193375
1989	30072.247251753226
1990	29511.14630256418
1991	28967.358811700375
1992	28449.699113694154
1993	27952.28092470237
1994	27472.414998719865
1995	27011.127167985145
1996	26571.00540410683
1997	26148.827279945694
1998	25743.36332936667
1999	25355.2339245573
2000	24984.99429795926
2001	24632.868357003998
2002	24298.368460924612
2003	23982.731496659555
2004	23680.27678517051
2005	23388.63658021227
2006	23110.512832315617
2007	22844.41901043185
2008	22589.855922438906
2009	22343.26331004676
2010	22110.75556302824
2011	21861.28419298807
2012	21617.497076018895
2013	21384.0794608684
2014	21158.63842251142
2015	20939.651132365438
2016	20723.898492230965
2017	20505.77714419138
2018	20283.894997589716
2019	20072.2111598996
2020	19890.965406103216