Year	cubic meters
1961	155.26518063028442
1962	155.91231861685705
1963	156.56487366299797
1964	157.19844357976655
1965	158.4065244667503
1966	160.21573604060916
1967	162.09276199646928
1968	164.01429035401105
1969	165.95465001643117
1970	166.85940855773998
1971	166.83184671291707
1972	166.96974706563068
1973	167.1078755790867
1974	167.220757890833
1975	165.99719941358615
1976	165.1546567072413
1977	164.51119001856858
1978	162.8076419650399
1979	161.1657549897556
1980	159.4845963144847
1981	158.3161432306525
1982	154.9564587693082
1983	152.78769469085452
1984	152.755805476825
1985	150.09570458787584
1986	147.6085946200321
1987	146.59564277109308
1988	145.39696249910028
1989	143.98868619590445
1990	142.58689329982778
1991	138.79536615866647
1992	137.37085779259994
1993	136.00568800025854
1994	134.7396057065558
1995	133.80354460162314
1996	132.92796883431384
1997	131.92577672933794
1998	131.07112360396277
1999	130.2963532501845
2000	129.4583003278756
2001	128.48957326195588
2002	127.53523634425927
2003	126.69914848136646
2004	125.85105216463809
2005	125.0513824987495
2006	124.59660307716602
2007	124.16282294627317
2008	123.35757330004715
2009	122.4310688838408
2010	121.83118299284935
2011	121.31607522077122
2012	120.23007989943528
2013	118.55378468285103
2014	116.21003410361793
2015	113.46963170678549
2016	110.90223912718841
2017	107.90621347481512
2018	104.2032065699606
2019	100.18608821930636
2020	97.99507890059225