Year	cubic meters
1961	971.5394458894166
1962	943.1247285148103
1963	915.5839450524068
1964	888.9999715520008
1965	863.4462260492352
1966	838.8254430616074
1967	815.0371086395563
1968	792.2219199203976
1969	770.4172117368439
1970	749.5115326268794
1971	729.6123382032525
1972	710.4697666695492
1973	691.7840953697507
1974	673.520021537246
1975	655.4924555627617
1976	637.6786456725853
1977	620.0503374579673
1978	602.3732473304968
1979	584.5852225875044
1980	566.96900153681
1981	549.7731635927016
1982	533.1753103270726
1983	517.2460166884255
1984	501.8749330534688
1985	486.9485273146124
1986	472.438989228931
1987	458.31968741025935
1988	444.59958852943225
1989	431.24293454656345
1990	418.12772440078714
1991	405.3440560347623
1992	392.9209564279848
1993	380.7212339545036
1994	368.68013774732646
1995	356.63636072769305
1996	344.8297265293371
1997	333.5175303007823
1998	322.43443526069285
1999	311.6244188538472
2000	301.1357550097159
2001	290.9047386719617
2002	280.9774192898384
2003	271.3012148868403
2004	261.84110957788596
2005	252.61235457738277
2006	243.64490551032887
2007	234.93286591985313
2008	226.46136326505524
2009	218.2328563282696
2010	210.24123499786126
2011	202.50982577674668
2012	194.9382121058078
2013	187.6353755728441
2014	180.67300591461475
2015	173.8860511789375
2016	167.29007712215946
2017	161.00895016552178
2018	155.02462721227894
2019	149.2957951948338
2020	143.83380964926783