Year	cubic meters
1961	9715.224524657864
1962	9677.364435014464
1963	9435.674490965988
1964	9209.444211245907
1965	8987.991410940098
1966	8747.78623764469
1967	8526.036873426738
1968	8307.219450938357
1969	8086.5077721400685
1970	7871.152460750172
1971	7662.820837736441
1972	7476.110539777114
1973	7304.196845643879
1974	7149.076984779134
1975	7014.500402079672
1976	6894.612496360614
1977	6784.9432109602185
1978	6677.140724705865
1979	6571.58931486385
1980	6471.444813818819
1981	6371.195586805975
1982	6263.922486969815
1983	6159.819335466618
1984	6063.625173396229
1985	5967.7742467003545
1986	5869.1301200828475
1987	5768.12927672728
1988	5669.287282315553
1989	5575.737521345861
1990	5486.631732896577
1991	5403.387105162171
1992	5326.885788636009
1993	5254.582762231579
1994	5184.890516959371
1995	5118.709083517714
1996	5055.280498795404
1997	4993.895081186417
1998	4936.185845469419
1999	4883.430597568799
2000	4835.0703605728995
2001	4790.00089835611
2002	4747.620299783359
2003	4707.5031712925265
2004	4669.1674650263
2005	4631.679786565729
2006	4595.493987749771
2007	4560.694774890664
2008	4526.705843237338
2009	4493.651434344157
2010	4461.37053154196
2011	4427.460666665776
2012	4389.85394920705
2013	4353.2944626170965
2014	4318.629276888757
2015	4285.982544779824
2016	4253.986646882051
2017	4221.793280807342
2018	4194.367549930743
2019	4170.736743674866
2020	4151.0601236064995