Year	cubic meters
1961	969.6853277565722
1962	954.8948656253131
1963	939.6420938604451
1964	923.4673270986631
1965	908.3892619617912
1966	891.6715404559393
1967	872.0554945815401
1968	852.628406922157
1969	833.665900329523
1970	815.2413232467727
1971	797.078950503502
1972	778.8917091904927
1973	760.6278415759706
1974	742.1997753405428
1975	715.2445338833982
1976	681.6150476748727
1977	656.4067917530048
1978	637.8509860545596
1979	619.0902054667201
1980	600.1800059745847
1981	581.1995510185668
1982	562.3473007329565
1983	543.8032897125443
1984	525.719691888155
1985	508.1574244320843
1986	491.5098415810508
1987	476.848632166885
1988	463.92738725846755
1989	451.87717056830417
1990	440.746429373941
1991	430.3604838236
1992	420.4752727677715
1993	411.1598139482649
1994	402.5842998351362
1995	394.9361370673848
1996	388.03319027592346
1997	381.56426148418694
1998	375.84376875960663
1999	370.6244394045848
2000	365.4634771944064
2001	360.46938902730153
2002	355.6397822764842
2003	350.85603475655313
2004	345.95311143405945
2005	341.2660676785199
2006	336.3832238475278
2007	330.95154350921104
2008	325.3437298305401
2009	319.55302240419854
2010	313.6683427624411
2011	307.7698463868075
2012	301.84729092794436
2013	295.9688085138387
2014	290.1690209392281
2015	284.42344280377836
2016	278.80979378710043
2017	273.4065227547301
2018	268.2519169565335
2019	263.3626760926167
2020	258.8393273574366