Year	cubic meters
1961	1788.813242557736
1962	1768.480789217546
1963	1745.2461578536077
1964	1721.2892327899176
1965	1704.5662340057784
1966	1691.8657870648021
1967	1675.6726254648154
1968	1659.717374283763
1969	1646.783395753388
1970	1640.9352106121974
1971	1634.968810529687
1972	1621.5079721620964
1973	1606.849495761035
1974	1591.5009573204873
1975	1575.7661744092693
1976	1560.1214333324604
1977	1545.1561804085152
1978	1532.9352277667194
1979	1520.6874346987452
1980	1506.7120366895624
1981	1493.0949789193653
1982	1479.4172895468873
1983	1465.6097942983843
1984	1452.4118083898136
1985	1440.7872074224197
1986	1431.0078414691068
1987	1422.956779413426
1988	1417.071433116859
1989	1411.9557723820872
1990	1406.426139458382
1991	1401.4466747056367
1992	1397.155282366516
1993	1393.6047271072343
1994	1390.6671497332359
1995	1388.7810021391892
1996	1387.724900108403
1997	1386.816856862389
1998	1386.3211126799474
1999	1386.4362202737793
2000	1400.9911332682623
2001	1401.3776797557084
2002	1402.0269333559054
2003	1402.9735186130874
2004	1403.7946770096305
2005	1404.4117656691806
2006	1405.3020315240183
2007	1406.065388336373
2008	1405.8736509350542
2009	1404.9213082868366
2010	1408.9396273049765
2011	1408.1822482076218
2012	1408.1856148374843
2013	1409.0358524966591
2014	1410.090857468095
2015	1411.0308707229312
2016	1411.6375345676718
2017	1411.461371804574
2018	1411.4641966043228
2019	1411.8090185885992
2020	1414.2827251433876