Year	cubic meters
1961	6894.700322583957
1962	6673.929416522491
1963	6463.5053982647
1964	6262.803769301761
1965	6074.373073002074
1966	5894.022959100497
1967	5719.2699972450155
1968	5554.4039687279965
1969	5398.632744568401
1970	5250.3747315327
1971	5108.872241453563
1972	4973.754450187425
1973	4844.179244526541
1974	4720.219532388941
1975	4602.020228130955
1976	4488.7435682034975
1977	4380.181894974794
1978	4276.27035709405
1979	4177.136169662118
1980	4082.8381806178118
1981	3993.0375019285525
1982	3906.913058216828
1983	3822.870624460223
1984	3740.7849344741826
1985	3661.692063227917
1986	3585.418788357306
1987	3511.277925865717
1988	3438.5847546028385
1989	3366.746260368683
1990	3296.3931567439154
1991	3228.730702151379
1992	3163.9860299918946
1993	3101.870441075417
1994	3042.491041482229
1995	2986.116590952727
1996	2932.985402219633
1997	2883.4086945937684
1998	2837.4357018958663
1999	2793.836060553246
2000	2751.5015880847573
2001	2710.796120447016
2002	2671.942027726572
2003	2634.5728606259386
2004	2598.658627706987
2005	2564.16747265179
2006	2531.1907324382755
2007	2499.4134355277897
2008	2467.723230243408
2009	2435.7225767954824
2010	2403.9063990453933
2011	2372.841685921183
2012	2342.7650729018646
2013	2313.6636805308945
2014	2285.5219962040883
2015	2258.3489719995478
2016	2232.2293645118466
2017	2207.143933209383
2018	2182.8927899608484
2019	2159.5529155710383
2020	2136.4288945553244