Year	cubic meters
1961	13274.976613740939
1962	13025.704760797744
1963	12703.056792913221
1964	12393.768865322581
1965	12093.313264514647
1966	11787.839637253177
1967	11497.509753086046
1968	11211.86956177405
1969	10928.696154918029
1970	10653.55227904003
1971	10390.358039393348
1972	10143.192739131475
1973	9903.783089613707
1974	9677.019749794388
1975	9465.6167984961
1976	9265.571715581855
1977	9074.12745448705
1978	8886.79377456725
1979	8702.141082221677
1980	8521.850616394064
1981	8345.502880160093
1982	8168.182502716196
1983	7994.951946925785
1984	7829.061804826222
1985	7666.470824285852
1986	7506.002499310528
1987	7348.147337064053
1988	7195.413141146222
1989	7048.447919251202
1990	6903.715175365933
1991	6770.079727391207
1992	6516.404756445994
1993	6345.852680224961
1994	6231.026473247729
1995	6123.744065853354
1996	6019.637881331455
1997	5919.688487172177
1998	5823.316763157924
1999	5730.9911606260375
2000	5642.198587525892
2001	5556.092065891713
2002	5472.843345316177
2003	5392.715620903358
2004	5314.526259139709
2005	5239.288293209437
2006	5161.133622205279
2007	5091.792865807892
2008	5023.478088660327
2009	4955.885860620846
2010	4888.891236517109
2011	4821.851358758149
2012	4722.6642584212095
2013	4657.653115482518
2014	4594.599673663889
2015	4533.777648403222
2016	4474.724596457124
2017	4416.7347680156645
2018	4361.019376719701
2019	4307.769298500339
2020	4257.763769639189