Year	cubic meters
1961	30585.73683851045
1962	28268.53996050851
1963	27596.43829479851
1964	26929.97870785276
1965	26268.973637129395
1966	25614.758592570925
1967	24964.84863287155
1968	24320.760475450857
1969	23689.797450673403
1970	23072.016217783395
1971	22471.508047236854
1972	21897.901456527816
1973	21331.20207233174
1974	20762.28030363802
1975	20205.748613376385
1976	19671.650982511805
1977	19151.4102107828
1978	18607.23926452394
1979	18065.32650789935
1980	17615.50901078471
1981	17280.300967611285
1982	16918.497350363188
1983	16477.933698412766
1984	16025.2170075557
1985	15587.890660276542
1986	15177.661250276682
1987	14781.510296078897
1988	14400.358679934981
1989	14023.007569771247
1990	13673.196285914893
1991	13343.205686663208
1992	12960.294837792964
1993	10990.49761314759
1994	10667.075767588884
1995	10365.61997289907
1996	10072.822000797954
1997	9797.657230949098
1998	9530.445866930864
1999	9267.697349604825
2000	9021.355367892897
2001	8781.403683082252
2002	8525.671534968636
2003	8272.228175224524
2004	8037.9766703303785
2005	7810.717052481871
2006	7588.19782329909
2007	7379.710206208471
2008	7176.157082436744
2009	6974.0483052701275
2010	6779.901484101366
2011	6589.0929665197755
2012	6071.790747909553
2013	5902.893953194054
2014	5735.84527157563
2015	5574.039247773134
2016	5415.929799299501
2017	5261.031275926958
2018	5113.507098054735
2019	4972.44861721899
2020	4836.1869548203595