Year	cubic meters
1961	10924.34458673485
1962	10573.042624122672
1963	10229.573130668065
1964	9895.030899350892
1965	9569.939775596846
1966	9257.491047451613
1967	8958.107879404944
1968	8670.703370213361
1969	8395.875765179384
1970	8132.941822661065
1971	7880.8925448008995
1972	7638.658079395576
1973	7405.636573038598
1974	7182.257961418807
1975	6968.595759120486
1976	6765.63763413559
1977	6568.961528290582
1978	6378.267405882388
1979	6199.514127859022
1980	6040.89618777504
1981	5907.521804857973
1982	5788.545453590775
1983	5674.226428826402
1984	5565.409247946656
1985	5462.655828935584
1986	5365.738369876876
1987	5273.7784742775775
1988	5184.301605175125
1989	5097.605497656603
1990	5004.868550125557
1991	4906.9246965220045
1992	4812.151716107427
1993	4720.223087206629
1994	4631.180066350204
1995	4545.981390241581
1996	4465.720978368495
1997	4389.208196928941
1998	4315.835410034543
1999	4245.609660723886
2000	4178.866009432876
2001	4114.9245920449675
2002	4052.8322455145126
2003	3992.996498923097
2004	3934.742421996353
2005	3878.894943990369
2006	3826.478463802683
2007	3776.442960619373
2008	3728.8772891124104
2009	3683.0446348629553
2010	3634.508784718812
2011	3582.9897203849714
2012	3533.2969481497485
2013	3487.0629028463522
2014	3444.0397889495785
2015	3404.0811537274976
2016	3365.722695012997
2017	3329.5544653973734
2018	3298.0184368261866
2019	3269.768422289009
2020	3246.0754907633595