Year	cubic meters
1961	2746.212121212121
1962	2723.0046948356808
1963	2702.7027027027025
1964	2685.185185185185
1965	2667.9890078852877
1966	2653.320768182109
1967	2639.0698825704903
1968	2626.25494234012
1969	2615.3575599615815
1970	2604.950303836014
1971	2594.092985495639
1972	2585.3124122721038
1973	2580.322457380947
1974	2578.6958393400646
1975	2578.8872723909662
1976	2579.5218555593
1977	2580.3699830578244
1978	2580.231681315977
1979	2577.917512364359
1980	2574.8382966034724
1981	2573.9418493992303
1982	2574.864587427405
1983	2573.9866729266023
1984	2569.91625546825
1985	2564.090412445083
1986	2558.158588754589
1987	2552.7247696165896
1988	2547.062378980503
1989	2540.4407061927586
1990	2532.857892034085
1991	2525.037180301778
1992	2518.2179172698375
1993	2512.187835972638
1994	2505.800279595467
1995	2499.180010420719
1996	2492.8245335194642
1997	2486.4124419118325
1998	2479.1774314972927
1999	2470.9254720140766
2000	2462.1125870089363
2001	2452.652266868932
2002	2442.2912269244116
2003	2430.9453508899446
2004	2417.1539246119696
2005	2400.614318859792
2006	2383.033328611092
2007	2364.549512631285
2008	2346.0127773563495
2009	2328.334693134319
2010	2310.1544911832957
2011	2292.1708454521986
2012	2276.287450521164
2013	2261.093168687078
2014	2244.50220021585
2015	2226.787768497431
2016	2209.975301163622
2017	2195.0121784573967
2018	2181.752173897866
2019	2169.4788823449258
2020	2161.5583279222324