Year	cubic meters
1961	342.3221422519662
1962	340.67342619523146
1963	339.16269210386855
1964	337.7893376795561
1965	336.56718301681997
1966	335.4382080890924
1967	334.39503757764237
1968	333.4653300264688
1969	332.5103701671696
1970	331.40428422888436
1971	330.1010934598721
1972	328.598772683584
1973	327.00710831701707
1974	325.4003441108639
1975	323.7686672872233
1976	322.1143586501798
1977	320.43194225816404
1978	318.7136716213363
1979	317.04011350036063
1980	315.4885142462782
1981	314.11474611675646
1982	312.9376237081544
1983	311.8847585817041
1984	310.9464822235783
1985	310.1845210169399
1986	309.633471378256
1987	309.29349633100594
1988	309.1644059019485
1989	309.1679902921251
1990	309.0378107761485
1991	308.4016314446303
1992	307.441624521544
1993	306.519281978582
1994	305.6795255853763
1995	304.99079309043356
1996	304.42211170008335
1997	303.9236543780203
1998	303.4417884859013
1999	302.83529545368515
2000	302.2780429008113
2001	301.45792589410536
2002	300.238314161866
2003	299.06653856649933
2004	297.9460345244968
2005	296.87134709084637
2006	295.8306369603402
2007	294.7200895949072
2008	293.4326113668458
2009	292.1936805811732
2010	291.21513153823474
2011	290.3958821863906
2012	289.648330720464
2013	288.9494880176259
2014	288.2955606087361
2015	287.68389293843927
2016	287.09954099960885
2017	286.5462933446042
2018	286.03300820914734
2019	285.5307302448426
2020	285.0088887147168