Year	cubic meters
1961	5467.145359607345
1962	5320.269682870399
1963	5184.277343911957
1964	5049.803403367182
1965	4915.857998066367
1966	4785.031759385459
1967	4659.258554866719
1968	4539.314734824734
1969	4426.560723746927
1970	4318.765214459989
1971	4215.198988136494
1972	4115.205751072442
1973	4017.3349416381216
1974	3923.1445195578667
1975	3833.9354059151515
1976	3750.99894645647
1977	3671.859344529646
1978	3595.9785778146297
1979	3525.796400258874
1980	3466.406682469164
1981	3435.7893181903614
1982	3397.896999589557
1983	3332.85000255881
1984	3268.357220779726
1985	3204.9987317391456
1986	3144.3706712094745
1987	3084.543732238712
1988	3022.9535590781443
1989	2965.380182419261
1990	2912.1443499462193
1991	2862.07647951775
1992	2815.0972784511237
1993	2775.7123218362963
1994	2745.458575895682
1995	2719.114435053091
1996	2696.157070555481
1997	2675.1614596009545
1998	2655.867385387768
1999	2638.485904104289
2000	2623.1513328394717
2001	2610.179030225807
2002	2600.113952530869
2003	2593.3949896537974
2004	2589.611235234618
2005	2588.6839564696975
2006	2590.1343555553494
2007	2585.9796883952386
2008	2575.7654909717194
2009	2566.0019030770354
2010	2556.4136542256715
2011	2546.702167336419
2012	2536.80682727267
2013	2526.819366526546
2014	2517.1003390596966
2015	2508.3990444010706
2016	2500.5959513703683
2017	2494.1539775452743
2018	2490.3040656484304
2019	2488.767505963568
2020	2483.8182340862813