Year	cubic meters
1961	15888.576023905605
1962	15666.957719038877
1963	15451.999467542588
1964	15242.331459261248
1965	15043.00126577914
1966	14855.776345059825
1967	14676.271252908688
1968	14504.455378740478
1969	14336.67712100351
1970	14174.181898145842
1971	13987.256823173591
1972	13824.960254426154
1973	13671.000140488404
1974	13523.388493448541
1975	13382.55037136263
1976	13252.806374837462
1977	13124.987149380442
1978	12997.334624492403
1979	12870.389652034806
1980	12748.057439609147
1981	12632.19732164548
1982	12524.010417254216
1983	12421.102519389033
1984	12324.258576026796
1985	12228.60158400883
1986	12133.047311299504
1987	12038.394183723973
1988	11943.162133788335
1989	11843.494962191826
1990	11737.342414331686
1991	11618.931203876598
1992	11461.250828906508
1993	11223.622936967653
1994	11129.530340080257
1995	11039.601238024052
1996	10952.735025906179
1997	10867.370406073562
1998	10786.282998943774
1999	10706.307766753227
2000	10629.101801049605
2001	10549.42304339769
2002	10470.191432302092
2003	10393.171173358745
2004	10316.927715630272
2005	10242.780234736016
2006	10167.641763572901
2007	10093.237582010863
2008	10016.494945874452
2009	9946.871559408803
2010	9881.74353646775
2011	9831.142600560697
2012	9771.509953141665
2013	9711.039920229105
2014	9649.11798802736
2015	9589.316283168973
2016	9528.610752479824
2017	9471.483283939722
2018	9415.719794199396
2019	9366.026962562919
2020	9314.938977442887