Year	cubic meters
1961	19121.77968776893
1962	18749.912494101627
1963	18381.266984935242
1964	18013.56543264049
1965	17644.51745583151
1966	17279.560712067854
1967	16917.644445912574
1968	16557.493305785407
1969	16203.56782615648
1970	15854.370170746446
1971	15514.834984622152
1972	15185.156241620198
1973	14862.068828475303
1974	14545.40010528169
1975	14232.840217841445
1976	13927.598132999145
1977	13621.59056467747
1978	13312.04659619297
1979	13006.474888316248
1980	12704.76823669483
1981	12410.931839312621
1982	12124.456876940554
1983	11839.434803780781
1984	11562.507839111962
1985	11299.518128571755
1986	11049.830946506665
1987	10815.114794094838
1988	10587.185499295032
1989	10352.530835995069
1990	10103.723747268246
1991	9845.619983210783
1992	9573.892699848851
1993	9319.445823056825
1994	9093.932754726125
1995	8885.672552386128
1996	8699.098914679878
1997	8524.944948081924
1998	8361.69503286627
1999	8209.365494330339
2000	8070.196868828762
2001	7941.955286150613
2002	7824.041027976354
2003	7717.194641665967
2004	7621.914581103304
2005	7540.39073833056
2006	7473.894820428741
2007	7419.426506780895
2008	7373.088391053728
2009	7333.423342286498
2010	7297.075312333784
2011	7269.020012506969
2012	7251.919764642639
2013	7238.4493868226255
2014	7217.217790944365
2015	7178.473994782748
2016	7113.8393031796995
2017	7032.502010224022
2018	6952.748531644056
2019	6874.188068906694
2020	6753.2971815001765