Year	cubic meters
1961	5138.492620763338
1962	5032.831568475621
1963	4927.3869648123555
1964	4823.920571844654
1965	4725.043262282911
1966	4631.581505263989
1967	4542.983271763118
1968	4458.330399708267
1969	4376.752509341933
1970	4297.80883905495
1971	4223.490919106743
1972	4157.356148333856
1973	4099.8399212555405
1974	4049.673301211449
1975	4006.59848512319
1976	3970.4768176024195
1977	3941.0513012809656
1978	3917.7856987666787
1979	3899.859545719561
1980	3886.1845425888405
1981	3870.6166180639602
1982	3847.0566887821965
1983	3817.8829758775296
1984	3787.179206200482
1985	3756.018793494244
1986	3724.3001793760527
1987	3691.3268344548364
1988	3656.442854699656
1989	3621.1002996337006
1990	3587.1975066530654
1991	3558.023978766848
1992	3534.949073364845
1993	3516.302193150516
1994	3501.357143296715
1995	3488.701029029525
1996	3477.140582745775
1997	3466.04408804443
1998	3454.851918992604
1999	3443.5118617782286
2000	3432.443488266617
2001	3422.1712347834796
2002	3412.6970414011535
2003	3403.809391317268
2004	3395.902147418143
2005	3389.615292891393
2006	3385.2457633365098
2007	3382.4651480533917
2008	3380.448856566721
2009	3378.4786831023334
2010	3376.314621506008
2011	3373.836482217881
2012	3370.68021069404
2013	3367.0215082189507
2014	3363.9174495363845
2015	3361.5834504273143
2016	3360.9557105035683
2017	3362.6180433744203
2018	3365.0405128985567
2019	3368.4740344289503
2020	3373.2429625143504