Year	cubic meters
1961	2133.043736988346
1962	2077.715299416075
1963	2023.171574100451
1964	1969.279137417384
1965	1916.5708429229053
1966	1864.8542651873408
1967	1812.9937482535943
1968	1763.164607723944
1969	1714.3052281619998
1970	1666.5299941765984
1971	1620.4233033220842
1972	1575.8154536985369
1973	1531.476880601517
1974	1488.1131530097414
1975	1443.8602946085698
1976	1396.444549474446
1977	1351.2909479183634
1978	1312.9630306120507
1979	1274.8251375302339
1980	1234.6221893431402
1981	1192.1992385018232
1982	1151.677934372493
1983	1115.2806504706075
1984	1079.849040756001
1985	1046.2080470819108
1986	1014.021467815507
1987	983.5294231912218
1988	955.2399243684013
1989	928.2975624992821
1990	899.5897870414965
1991	874.8611403222632
1992	851.566906051707
1993	832.3599711902189
1994	814.6891387162635
1995	797.0761170869
1996	780.3143104695091
1997	763.9827318094754
1998	748.2057083831353
1999	732.9059792911883
2000	717.9177938469378
2001	703.3395464403877
2002	690.1596053883167
2003	677.4488490604689
2004	664.1171888625082
2005	650.2199373095655
2006	635.567822947389
2007	620.6924470399367
2008	606.0533166463885
2009	591.9839149053646
2010	579.0952631400197
2011	567.6176696166501
2012	556.5532552355666
2013	545.1365383267245
2014	533.9296092672918
2015	523.2125158805555
2016	513.4095835432393
2017	504.45572700902125
2018	495.57436610717156
2019	487.0617824711245
2020	480.19690634796586