Year	cubic meters
1961	7761.456297568026
1962	7714.032133011232
1963	7664.638881932648
1964	7613.720256136624
1965	7564.411999688071
1966	7511.541141530273
1967	7455.607280902069
1968	7416.994059527176
1969	7391.425006265913
1970	7365.657767969995
1971	7332.862074730664
1972	7290.367793753109
1973	7250.087824927516
1974	7237.75825308414
1975	7256.986928055419
1976	7269.819344989277
1977	7267.028961092327
1978	7272.914805737139
1979	7285.323054404806
1980	7285.315334277422
1981	7266.760121605927
1982	7261.550486259825
1983	7273.294709934395
1984	7273.752571271534
1985	7270.338275621168
1986	7265.719516277457
1987	7261.1229181370445
1988	7250.850557728833
1989	7218.257940379026
1990	7163.463730080686
1991	7092.298266990471
1992	7014.671759913548
1993	6957.0646651571105
1994	6930.340501489519
1995	6919.7378350379795
1996	6910.401121143478
1997	6902.574923999513
1998	6895.004995117709
1999	6881.602897980612
2000	6865.074818081759
2001	6838.845587943638
2002	6805.282433450215
2003	6772.212209609079
2004	6730.326582367083
2005	6684.630903243127
2006	6651.637191649752
2007	6630.11104712719
2008	6609.388504182421
2009	6592.0976570126795
2010	6576.269662448449
2011	6554.13963630245
2012	6524.324877689668
2013	6485.984436231746
2014	6435.491336892589
2015	6363.752804534787
2016	6295.306173932671
2017	6251.729171454923
2018	6221.352791311734
2019	6193.749493238678
2020	6168.0877940944265