Year	cubic meters
1961	45164.84605827049
1962	44176.78944962407
1963	43204.23604867878
1964	42244.826377892015
1965	41289.78619648026
1966	40346.4873289177
1967	39418.19405944859
1968	38503.90593097994
1969	37615.13869044477
1970	36753.990747435724
1971	35923.3991903909
1972	35121.94561569159
1973	34383.25937115254
1974	33705.36962703872
1975	33047.41889376435
1976	32409.677979727792
1977	31779.837600846633
1978	31156.789646401197
1979	30552.883803160086
1980	29964.936422670067
1981	29398.91876006923
1982	28863.712102490008
1983	28308.28204692027
1984	27732.425128674524
1985	27190.137366048984
1986	26689.846839456895
1987	26228.53333300552
1988	25799.96485565218
1989	25394.144188345745
1990	25007.760061564775
1991	24650.61114120604
1992	24317.487447746076
1993	23997.14637842906
1994	23686.076439465905
1995	23386.09258831107
1996	23093.555914558354
1997	22805.39777475899
1998	22526.638345132225
1999	22263.844945596556
2000	22021.00858678794
2001	21792.976029073758
2002	21574.764152414908
2003	21370.593692269376
2004	21183.62736284161
2005	21012.281099983273
2006	20853.31654864552
2007	20699.486168488987
2008	20578.916018116834
2009	20458.694206500935
2010	20303.299055285144
2011	20138.761448498288
2012	19968.861877425476
2013	19799.2692118955
2014	19634.857440518404
2015	19477.915340177187
2016	19324.621438894585
2017	19178.27150033312
2018	19040.742289705082
2019	18906.410102584054
2020	18770.87178495005