Year	cubic meters
1961	64546.69264799288
1962	62474.83390700677
1963	60756.244178791785
1964	59096.87031306558
1965	57499.229039964746
1966	55971.47543838711
1967	54512.074319557345
1968	53116.326683286854
1969	51780.10251135512
1970	50498.45896389565
1971	49264.27625678217
1972	48069.66075687142
1973	46910.44572072111
1974	45787.66898907802
1975	44703.42849103379
1976	43656.64814043599
1977	42632.76231875652
1978	41629.55992937346
1979	40660.6538958034
1980	39735.296958571824
1981	38865.341107065535
1982	38035.080406213354
1983	37227.910217420096
1984	36451.16693392618
1985	35707.55727429605
1986	34995.37319417679
1987	34311.34569823457
1988	33650.19467542793
1989	33012.821609829225
1990	32389.337468422047
1991	31784.138363762453
1992	31206.138759311907
1993	30650.403289889866
1994	30114.299654962826
1995	29599.170487428662
1996	29107.769229232385
1997	28636.496586185458
1998	28184.181925181856
1999	27751.63570386214
2000	27339.042352556786
2001	26946.71969667732
2002	26573.611163464273
2003	26220.89603367958
2004	25883.003671293693
2005	25556.95045027081
2006	25245.49509932184
2007	24947.149785611015
2008	24661.526284276984
2009	24385.073576800405
2010	24123.921859155806
2011	23846.694113804962
2012	23576.078783366665
2013	23316.713532603193
2014	23066.031427248494
2015	22822.777167894114
2016	22586.583417939826
2017	22359.740439804784
2018	22146.004804164808
2019	21946.458003334483
2020	21767.926379890643