Year	cubic meters
1961	4259.839777081157
1962	4225.032668939724
1963	4122.461840591499
1964	4027.894122616721
1965	3933.1082167551053
1966	3824.9932009790587
1967	3727.917301703002
1968	3631.8446501659114
1969	3533.6829873433626
1970	3437.4293517777387
1971	3344.2911408207065
1972	3263.1114926394675
1973	3189.445994058553
1974	3124.229466318654
1975	3069.527878262103
1976	3022.3974814249723
1977	2981.488253281821
1978	2941.8562695769037
1979	2902.874598170288
1980	2866.6935035949596
1981	2830.206714056455
1982	2788.832376590028
1983	2748.8248917727765
1984	2712.9939960938445
1985	2676.301567970772
1986	2636.7888712867575
1987	2594.8424174496213
1988	2553.398146383087
1989	2514.548786483708
1990	2477.922100802953
1991	2444.3420984028226
1992	2414.5686155008284
1993	2386.96921353654
1994	2360.142133768517
1995	2334.6377779898826
1996	2310.295265081516
1997	2286.7711318415545
1998	2264.933349974033
1999	2245.4070493759655
2000	2227.7837396893033
2001	2211.6601800526796
2002	2196.891596376133
2003	2183.2505433095316
2004	2170.3219335300814
2005	2157.595189151045
2006	2145.581303107504
2007	2134.4047469999277
2008	2123.496306585488
2009	2112.960653816685
2010	2102.7805084080574
2011	2091.3210436903128
2012	2077.1826700832235
2013	2063.393092925677
2014	2050.4278862274577
2015	2038.5401417535115
2016	2026.8916766946008
2017	2014.661065810065
2018	2005.261056773789
2019	1998.1601781572656
2020	1993.4093969243854