Year	cubic meters
1961	18777.70726409179
1962	18217.038695189363
1963	17772.092843670143
1964	17332.360815618715
1965	16897.645759608473
1966	16469.794323021477
1967	16048.22665707016
1968	15633.64244971083
1969	15230.232936807834
1970	14846.733352201309
1971	14504.75052332063
1972	14166.282220587938
1973	13806.067574065912
1974	13450.704341954162
1975	13108.883585366792
1976	12783.13473372736
1977	12457.507725275433
1978	12122.779211610117
1979	11785.038748945688
1980	11456.55244804071
1981	11153.836381434558
1982	10856.383071107492
1983	10557.13864065175
1984	10268.557889261014
1985	9986.620528574873
1986	9716.359551619562
1987	9457.259539483923
1988	9208.590194839906
1989	8967.506782787283
1990	8737.387347558762
1991	8520.31597953053
1992	8141.923492177458
1993	7579.680352505999
1994	7370.026367148338
1995	7185.26791781552
1996	7005.7282384027785
1997	6835.101027425791
1998	6669.681531669228
1999	6508.4024043751815
2000	6351.242721530855
2001	6197.362907804099
2002	6045.7585830454655
2003	5899.994494147809
2004	5759.0364726222215
2005	5625.66066273312
2006	5495.327115865552
2007	5368.874404251467
2008	5247.986168208724
2009	5129.518012006739
2010	5010.642431013761
2011	4894.822987040813
2012	4658.262682182265
2013	4559.376875093616
2014	4464.218665086461
2015	4370.977221351386
2016	4277.996131919897
2017	4185.44529065258
2018	4094.023455621379
2019	4003.7493491743476
2020	3914.57415398154