Year	cubic meters
1961	46933.12982924736
1962	45801.52671755725
1963	44931.50684931507
1964	44058.38631682636
1965	43203.37197049526
1966	42228.13492404085
1967	41698.44902110348
1968	40969.27304521609
1969	40120.688249204926
1970	39337.97073638762
1971	38030.455283295974
1972	37337.785535402596
1973	36771.3004484305
1974	35852.21890257233
1975	35413.517598790764
1976	35060.21520701204
1977	34667.41826381059
1978	34266.61094860008
1979	33898.30508474576
1980	33487.612306016876
1981	32968.66770397352
1982	32402.00189051192
1983	31961.600345912862
1984	31580.18179272861
1985	31162.29271374926
1986	30714.773993576116
1987	30251.095157279255
1988	29760.169328104897
1989	29260.605899128463
1990	28830.724269984967
1991	28465.573665780375
1992	28148.651196160343
1993	27899.36811333585
1994	27631.961148114726
1995	27325.921936061564
1996	26996.22991064851
1997	26705.694614845535
1998	26440.831867264445
1999	26153.152007647775
2000	25855.542561218517
2001	25525.687791473392
2002	25236.96846558719
2003	24948.35766026391
2004	24683.0312488179
2005	24384.38836123231
2006	24057.543296487805
2007	23622.475960049593
2008	23153.813939057185
2009	22681.53561187799
2010	22331.40808151872
2011	22023.25297412393
2012	21642.103392509674
2013	21272.797293719694
2014	20957.85401116713
2015	20658.385257470873
2016	20338.220472675952
2017	20006.02783245098
2018	19708.965872964178
2019	19419.90839013459
2020	19181.84891814372