Year	cubic meters
1961	1849.5544608590105
1962	1833.8874910471604
1963	1817.1893344314292
1964	1799.9860690621197
1965	1786.7564963410791
1966	1773.754434386086
1967	1755.647576918685
1968	1738.9729488320572
1969	1725.0584988125179
1970	1714.1937500590657
1971	1704.5281529131125
1972	1691.881730175653
1973	1679.001759320245
1974	1664.9113886856937
1975	1649.18759809317
1976	1633.9554490049256
1977	1620.3462149408094
1978	1609.3505544224438
1979	1599.8897431651385
1980	1589.8319221366564
1981	1579.6107776362976
1982	1570.0400108700185
1983	1561.4230340775562
1984	1553.2983876982507
1985	1546.059757711391
1986	1539.5266712855805
1987	1533.3863455923404
1988	1528.4597895388672
1989	1528.0496512510585
1990	1529.508887854513
1991	1532.4015771848856
1992	2375.556972912184
1993	2273.769767965889
1994	2274.189919480716
1995	2277.4470231197874
1996	2282.392472733296
1997	2286.65140715333
1998	2290.4961756101384
1999	2294.2216962696393
2000	2307.1924430682907
2001	2324.07490909278
2002	2339.291160092547
2003	2346.6537375152484
2004	2353.1078911582695
2005	2359.538767648199
2006	2365.5491261474713
2007	2374.3876706525302
2008	2382.90964743937
2009	2387.489178841985
2010	2396.1552649236896
2011	2401.846033845784
2012	2407.3626252820045
2013	2412.506132505547
2014	2417.577174515786
2015	2423.156329193104
2016	2429.358260077322
2017	2435.368990083889
2018	2440.1577901737564
2019	2443.491941686628
2020	2448.7149770928054