Year	cubic meters
1961	22228.232359034173
1962	21626.112002048645
1963	21036.33640243759
1964	20458.056772825305
1965	19955.936596054
1966	19492.8395173072
1967	18997.6074796913
1968	18496.64302925736
1969	18000.121017309382
1970	17519.11946286434
1971	17057.447144791466
1972	16614.248015983325
1973	16187.276468722905
1974	15777.849134718588
1975	15384.883298530565
1976	15006.576109570977
1977	14642.952632039363
1978	14291.583879031085
1979	13951.599498322958
1980	13623.56298304024
1981	13308.383865845479
1982	13004.68628672935
1983	12712.96827493157
1984	12435.628665659817
1985	12176.122647012704
1986	11935.416925125961
1987	11707.944124565984
1988	11489.820745648558
1989	11280.85676439054
1990	11082.023475707938
1991	10890.62703015757
1992	10705.966049269315
1993	10528.468570643749
1994	10356.10317756816
1995	10188.242401860962
1996	10024.641190769458
1997	9865.218498658396
1998	9712.036178828592
1999	9567.438689031038
2000	9429.986312902958
2001	9297.947311972735
2002	9171.111265737289
2003	9049.215102407084
2004	8934.728482311753
2005	8822.791151933192
2006	8708.897359762324
2007	8595.39600920792
2008	8484.194880481222
2009	8376.998581952203
2010	8272.812310682373
2011	8169.576994665436
2012	8067.613531218661
2013	7970.359029554481
2014	7878.4759120936
2015	7791.441780306815
2016	7709.370238283815
2017	7632.169231494435
2018	7558.781829011998
2019	7488.23521351382
2020	7425.568579063545