Year	cubic meters
1961	3617.524825752092
1962	3584.3950653194756
1963	3553.0958248535926
1964	3517.96368113772
1965	3479.970703153116
1966	3444.516673288275
1967	3402.385959870755
1968	3358.1840969809746
1969	3325.254042531076
1970	3288.5270536503963
1971	3249.135341388579
1972	3213.4577762195977
1973	3178.1465158125507
1974	3143.6108582919874
1975	3109.8023094197365
1976	3077.1093723106424
1977	3045.604253635512
1978	3016.4195761507326
1979	2989.9441617172606
1980	2966.03213050328
1981	2945.0220268843964
1982	2927.393378383601
1983	2913.166293460898
1984	2901.094286503515
1985	2890.600743778606
1986	2881.9770279477134
1987	2874.5129064207754
1988	2868.4235296472593
1989	2863.930047581416
1990	2861.015225077766
1991	2853.7424162821812
1992	2839.8001567253023
1993	2825.112670422
1994	2811.6942612207586
1995	2799.3117519487564
1996	2787.6764245703393
1997	2776.0171787532136
1998	2764.552441210438
1999	2753.369751930547
2000	2741.085899913291
2001	2722.12676826858
2002	2683.9444464048397
2003	2635.842792362551
2004	2590.7523421321453
2005	2547.353106550947
2006	2504.6557428388865
2007	2458.7190034192777
2008	2419.805533808013
2009	2398.467086194221
2010	2387.44972641694
2011	2378.9812556173215
2012	2377.4371804450234
2013	2385.2400828870927
2014	2392.381452658321
2015	2394.2383944891867
2016	2392.2177885400806
2017	2386.6125117388287
2018	2376.182412514925
2019	2359.18923406906
2020	2347.6926477634483