Year	cubic meters
1961	14119.4767882813
1962	13891.29462536772
1963	13667.841586158633
1964	13450.960446944091
1965	13240.432053435483
1966	13033.901176961277
1967	12831.208874767137
1968	12633.59868361363
1969	12440.339624680066
1970	12246.88221431012
1971	12054.47018766457
1972	11863.748585390184
1973	11670.389201085123
1974	11473.588310519623
1975	11284.780795838298
1976	11106.776171872341
1977	10930.68820661097
1978	10756.601283844568
1979	10585.795443134086
1980	10419.341752375567
1981	10255.947351866978
1982	10095.854607523306
1983	9939.702429137325
1984	9788.082319247222
1985	9641.06448974072
1986	9496.45193692821
1987	9354.041601074921
1988	9214.032896369394
1989	9077.974390536821
1990	8946.720654610715
1991	8820.216588876081
1992	8698.686870657824
1993	8581.360110311622
1994	8466.54219689837
1995	8355.722568262963
1996	8251.067086205172
1997	8152.787481316645
1998	8058.908412575817
1999	7966.598996956077
2000	7876.825015846714
2001	7790.719294967652
2002	7707.530267629735
2003	7628.370054530305
2004	7551.308295194916
2005	7473.669201221658
2006	7396.739927407077
2007	7322.6799875243605
2008	7250.376789915043
2009	7177.209077360433
2010	7158.888815910719
2011	7076.816663673561
2012	6996.815562336344
2013	6918.950068283166
2014	6843.29556240406
2015	6769.920944480018
2016	6698.727572109508
2017	6629.611828735058
2018	6562.6085667842735
2019	6497.738519964702
2020	6435.011682080541