Year	cubic meters
1961	19967.07148232379
1962	19218.230207086188
1963	18486.916608945176
1964	17781.406258388546
1965	17102.577628208128
1966	16449.74862968713
1967	15821.478377553101
1968	15215.522208840766
1969	14621.84992280904
1970	14029.357946908265
1971	13436.22784023479
1972	12849.532707779821
1973	12279.913631487207
1974	11733.22697487816
1975	11211.002773424672
1976	10757.85173373057
1977	10361.520516727573
1978	9978.163353078427
1979	9609.362650643392
1980	9253.583595963782
1981	8912.47713162061
1982	8587.279628266007
1983	8278.3436848541
1984	7986.3595805394325
1985	7711.70429768945
1986	7453.363131266102
1987	7205.890599876326
1988	6958.132489398673
1989	6703.339622294205
1990	6451.428734549399
1991	6212.169854176508
1992	5985.209584373773
1993	5770.3075174400865
1994	5567.194127639011
1995	5373.529158983246
1996	5188.054834579777
1997	5010.611685223776
1998	4845.201365282404
1999	4700.874727316842
2000	4573.899368261401
2001	4455.663366166695
2002	4345.196084324626
2003	4241.448835646674
2004	4143.456560543887
2005	4050.560312574212
2006	3962.038473951067
2007	3877.341972075468
2008	3795.60836652062
2009	3716.0694663184536
2010	3638.2503406006485
2011	3563.5257832035136
2012	3491.0274597205216
2013	3419.782077457975
2014	3341.5153493794783
2015	3256.38188765135
2016	3173.4203168778304
2017	3092.3998117193746
2018	3014.0439385160144
2019	2938.707338213051
2020	2865.9033954838524