Year	cubic meters
1961	9770.479034822914
1962	9734.142750359839
1963	9490.855075917443
1964	9263.357647833454
1965	9040.638154502303
1966	8798.832061413737
1967	8576.023021466299
1968	8356.16961983355
1969	8134.165830078576
1970	7917.4824385396605
1971	7707.768384027657
1972	7519.980142901404
1973	7346.987587906516
1974	7190.715609028219
1975	7055.18918900782
1976	6934.457664290615
1977	6823.992300697068
1978	6715.375470815501
1979	6609.051862677233
1980	6508.240947468869
1981	6407.3218735491555
1982	6299.23447793944
1983	6194.353183657015
1984	6097.516622951976
1985	6001.0241078184645
1986	5901.681185716545
1987	5799.916940440399
1988	5700.33055828805
1989	5606.1188767434705
1990	5516.428291066897
1991	5432.716063027147
1992	5355.86903142598
1993	5283.294481213757
1994	5213.345031797879
1995	5146.783973149719
1996	5082.853470381562
1997	5020.945674919257
1998	4962.724599245443
1999	4909.4983372635525
2000	4860.691762250211
2001	4815.185838821265
2002	4772.36316592258
2003	4731.887813015542
2004	4693.282915267768
2005	4655.497958481774
2006	4618.99170230118
2007	4583.8600770961
2008	4549.531689727683
2009	4516.152775745881
2010	4483.542150595071
2011	4449.255514439018
2012	4411.221621877148
2013	4374.275336342576
2014	4339.277726342332
2015	4306.3479444045815
2016	4274.077296381691
2017	4241.593462206371
2018	4213.947049529713
2019	4190.14930482436
2020	4170.360778428409