Year	cubic meters
1961	3611.2619926053226
1962	3586.909842775423
1963	3560.8366502770623
1964	3531.664517027945
1965	3502.0489384953853
1966	3474.932881433386
1967	3449.8728745474996
1968	3428.14743851641
1969	3408.7969374994746
1970	3390.816183390203
1971	3375.0364550170516
1972	3355.930236738352
1973	3333.247734313891
1974	3311.5065435006395
1975	3291.7876067930306
1976	3275.4073799145917
1977	3261.525502868704
1978	3249.924944541589
1979	3240.541449907737
1980	3233.8728136073855
1981	3229.9927391533083
1982	3227.6007865654274
1983	3226.429553147109
1984	3225.7084972656066
1985	3224.7764041643895
1986	3224.6006817954326
1987	3224.271624231336
1988	3222.7140132858462
1989	3220.297593964799
1990	3217.6030567405346
1991	3215.37624280238
1992	3213.192958293794
1993	3211.2291457280594
1994	3210.5750183838404
1995	3210.5240168042874
1996	3209.621844816419
1997	3207.924180914127
1998	3207.0012650873155
1999	3206.461865759866
2000	3205.0095511040795
2001	3203.20987957686
2002	3198.443323768323
2003	3184.257561037027
2004	3163.716138767836
2005	3148.208115842466
2006	3138.76007694623
2007	3122.9513652944447
2008	3102.3311494225304
2009	3088.2286622647985
2010	3078.7441362365707
2011	3073.4539150068567
2012	3065.1808439062615
2013	3029.8528663603456
2014	3002.1809816687655
2015	3005.0757623235027
2016	3010.185246305233
2017	3014.699725417845
2018	3020.435022084759
2019	3055.4630499002656
2020	3070.382366577039