Year	cubic meters
1961	3648.776626340663
1962	3617.544324495426
1963	3586.322641238044
1964	3555.366655582419
1965	3524.3029075594886
1966	3495.089256619054
1967	3469.6740150123214
1968	3445.9072374965826
1969	3422.23118395436
1970	3403.2672325980543
1971	3384.464169831612
1972	3361.8235041768057
1973	3341.021216571462
1974	3322.9480083686803
1975	3307.0418100426314
1976	3293.5266295575407
1977	3281.0877860824094
1978	3268.051012422057
1979	3254.6688669812106
1980	3240.3613998466326
1981	3227.651425462502
1982	3218.9320086867797
1983	3213.234216242294
1984	3208.927782673866
1985	3203.8609408490793
1986	3197.079178169147
1987	3189.468835332388
1988	3179.705100914197
1989	3166.5026098445646
1990	3151.8680996245444
1991	3134.518498647485
1992	3298.895679404909
1993	3270.083504084595
1994	3260.199398473391
1995	3252.259445427959
1996	3244.597811242192
1997	3237.192765775066
1998	3230.492932347477
1999	3222.4742595750745
2000	3212.50224575166
2001	3201.994757249686
2002	3186.574982847822
2003	3169.5469471545644
2004	3152.3767742679192
2005	3136.2968370113454
2006	3121.8736181891836
2007	3105.935918163463
2008	3090.9940809829195
2009	3081.14069042901
2010	3074.043453391707
2011	3080.7763658701783
2012	3074.1911281702105
2013	3063.9870416136496
2014	3053.7880800467615
2015	3044.9660781642633
2016	3036.4366185638737
2017	3030.398255193757
2018	3023.5488266068796
2019	3020.3641348060814
2020	3016.5065148638396