Year	cubic meters
1961	2400.32187488645
1962	2337.812824547873
1963	2278.676475556952
1964	2223.201112152523
1965	2167.1095541134728
1966	2110.8560452951856
1967	2055.315630923428
1968	2001.369626952293
1969	1949.320097315437
1970	1898.6076724307304
1971	1849.8083215859874
1972	1803.32131989689
1973	1758.700046550971
1974	1715.7344026578976
1975	1673.8502740929823
1976	1633.2032702811746
1977	1592.8401724397786
1978	1552.4742451214433
1979	1512.9649882685217
1980	1473.6937534288788
1981	1435.0567540203858
1982	1397.8082848097042
1983	1362.3094358108215
1984	1329.2221561532606
1985	1298.4060901155613
1986	1270.56753097096
1987	1245.7079454903976
1988	1222.5665550477454
1989	1200.9224409502294
1990	1180.2620784154728
1991	1160.553212505337
1992	1141.7018980124783
1993	1123.7358310958396
1994	1106.8047078587065
1995	1090.264583905409
1996	1074.1101562189515
1997	1058.505496819045
1998	1043.4723160497736
1999	1029.2083290494015
2000	1015.6047672487775
2001	1002.4162725759268
2002	989.6997172564418
2003	977.7059444858565
2004	965.6004828002414
2005	952.9473379613275
2006	940.5500375538927
2007	928.5160172054658
2008	916.7064116848836
2009	905.0373348185932
2010	893.273389555139
2011	881.3598738549122
2012	869.5086667376864
2013	857.8986447183455
2014	846.7498659726355
2015	836.2057963594367
2016	826.0398759641309
2017	816.2549575174478
2018	807.1808815255807
2019	798.8010712087633
2020	790.4325606755112