Year	cubic meters
1961	23985.626557244388
1962	23823.07868540244
1963	23655.248845480157
1964	23524.01637183599
1965	23445.723806744132
1966	23358.01351228337
1967	23231.860042590295
1968	23127.78924920928
1969	23141.214394700448
1970	23229.02055811738
1971	23199.723164424893
1972	23062.04962996187
1973	22931.449325461774
1974	22811.707053337184
1975	22710.678688468917
1976	22642.320740535088
1977	22579.070003979825
1978	22514.333424232325
1979	22456.86497967339
1980	22387.115064540794
1981	22291.83385542058
1982	22167.28510629835
1983	22035.562927286555
1984	21918.13147724314
1985	21826.90813074767
1986	21756.130450571494
1987	21694.511673776182
1988	21631.539674366486
1989	21553.58654701673
1990	21458.2333536752
1991	21341.35395931979
1992	21221.77107778037
1993	21119.336687031366
1994	21028.497938322827
1995	20948.39451112908
1996	20879.788423347665
1997	20817.78889789264
1998	20762.596589733806
1999	20714.45911836939
2000	20671.49916087237
2001	20624.4863153642
2002	20574.557002867747
2003	20525.553930988866
2004	20466.0443459014
2005	20396.119323779054
2006	20317.993691168016
2007	20231.738492489676
2008	20137.768686296662
2009	20041.69046227189
2010	19950.210241654844
2011	19857.943325800927
2012	19763.68177812552
2013	19672.83523430531
2014	19591.644218670583
2015	19527.218661597133
2016	19471.173837002254
2017	19425.534302044183
2018	19399.785151912103
2019	19378.41997418867
2020	19350.604561715136