Year	cubic meters
1961	19115.527163997416
1962	18713.97704325235
1963	18312.775833147425
1964	17916.57584228098
1965	17523.597351847377
1966	17134.16914379137
1967	16752.919499170268
1968	16376.913238254749
1969	16004.95839755366
1970	15634.697746293123
1971	15268.62215708834
1972	14905.619673948167
1973	14540.401523992532
1974	14172.33924043058
1975	13801.956694394294
1976	13439.483952812718
1977	13081.606286800416
1978	12723.560475312017
1979	12370.937992077592
1980	12028.719623061932
1981	11695.424180998572
1982	11366.31256754855
1983	11065.321323539354
1984	10783.25208339611
1985	10499.215915785762
1986	10222.041276232654
1987	9951.984051663003
1988	9687.41487524282
1989	9426.581565721017
1990	9182.784958876462
1991	8947.608800988748
1992	8709.794740054556
1993	8483.178284293323
1994	8265.738953095946
1995	8048.961482833713
1996	7838.307027416073
1997	7633.052051400832
1998	7430.7903434859
1999	7234.990426530361
2000	7041.380644113859
2001	6849.61515221291
2002	6662.307528064292
2003	6479.805072292318
2004	6301.556581466564
2005	6127.462431359883
2006	5958.666532764801
2007	5794.766809474054
2008	5635.128348371231
2009	5479.295155713315
2010	5327.641924180913
2011	5180.070734089073
2012	5038.349473825098
2013	4902.938215191906
2014	4771.682097138849
2015	4645.179128576248
2016	4522.481557792647
2017	4403.316107755429
2018	4288.836817026757
2019	4178.768796224496
2020	4072.2530660959123