Year	cubic meters
1961	60271.74831342133
1962	58812.41153004761
1963	57370.095960066494
1964	55958.37079833942
1965	54592.4626006636
1966	53279.78032336728
1967	52025.851067330346
1968	50827.864269618796
1969	49678.95506050217
1970	48572.165160306824
1971	47488.06405774549
1972	46400.804597883485
1973	45293.36161910219
1974	44182.92182794944
1975	43099.256482570214
1976	42046.643743459405
1977	41017.658627906734
1978	40008.61724063644
1979	39007.60648326424
1980	38000.436517834874
1981	36986.702806152694
1982	35981.42251477545
1983	34995.61507934134
1984	34032.482695791485
1985	33092.93344247402
1986	32177.978876394478
1987	31291.370802744015
1988	30433.584943647144
1989	29610.597860748192
1990	28823.448984342955
1991	28071.044214053945
1992	27355.296909015113
1993	26674.558080088424
1994	26027.178157814127
1995	25413.142765171484
1996	24832.038848345223
1997	24282.47869731351
1998	23763.8289743633
1999	23278.80588082326
2000	22834.53025955835
2001	22450.173566705125
2002	22131.79502855569
2003	21855.865609963585
2004	21601.366535679917
2005	21362.53537142876
2006	21139.452632720077
2007	20929.689659212778
2008	20725.763080082223
2009	20517.05072130585
2010	20282.171814957946
2011	20020.742858541133
2012	19752.42946441203
2013	19481.64828731335
2014	19209.548426204383
2015	18938.320964073842
2016	18670.366697172238
2017	18409.529905573272
2018	18158.31818588158
2019	17917.23340764646
2020	17677.200717059783