Year	cubic meters
1961	14132.022622732362
1962	14094.983293533238
1963	13759.771739204823
1964	13426.509605845104
1965	13095.574316072301
1966	12768.300867967677
1967	12448.44200465217
1968	12134.38491256075
1969	11824.3935039681
1970	11518.66206362696
1971	11225.589475848232
1972	10937.96228323071
1973	10646.126287978708
1974	10354.459931452599
1975	10062.036394880495
1976	9771.957645759188
1977	9485.110251680902
1978	9203.568521212579
1979	8919.026070333746
1980	8604.29579230468
1981	8286.906993830646
1982	8004.455706434781
1983	7759.995453319499
1984	7536.934963715698
1985	7309.690686117989
1986	7084.280484858996
1987	6867.079149985915
1988	6657.88610267078
1989	6458.991281064755
1990	6268.106589648408
1991	6086.838187766305
1992	5560.792235026326
1993	5420.71683218191
1994	5279.949631295762
1995	5141.963669862732
1996	5005.2344605386825
1997	4874.869422803065
1998	4749.81917470845
1999	4629.465880851779
2000	4506.039234220763
2001	4385.261909408979
2002	4278.104416374433
2003	4178.890048489393
2004	4080.845149450781
2005	3986.461844221423
2006	3894.560783442491
2007	3803.23123654309
2008	3713.0726597572834
2009	3623.585546503137
2010	3533.4412907751957
2011	3448.2336266905654
2012	3372.2251917677663
2013	3301.917667442502
2014	3235.2146140442874
2015	3172.235945010443
2016	3112.1985812157213
2017	3051.9222831124757
2018	2991.0303261901768
2019	2930.947798574758
2020	2870.6411062068264