Year	cubic meters
1961	68344.96265588525
1962	67144.68084034925
1963	65931.80179252086
1964	64706.96238826927
1965	63477.55433678652
1966	62263.205247542945
1967	61059.47345363067
1968	59871.94886935566
1969	58717.729561551045
1970	57583.84657935756
1971	56489.355993097
1972	55427.72536393498
1973	54378.617240128835
1974	53353.91015801761
1975	52357.46008725371
1976	51399.627930943316
1977	50438.26120399281
1978	49456.44278353224
1979	48484.378333301014
1980	47513.316349302455
1981	46550.76302519444
1982	45594.4764571496
1983	44620.783301118056
1984	43641.180035687576
1985	42673.27817989934
1986	41635.03921630366
1987	40528.23488138525
1988	39445.640825252114
1989	38469.27855436298
1990	36990.90116308641
1991	36544.95749250428
1992	37195.75615020204
1993	37246.64425194655
1994	37080.35753807747
1995	37001.500179572904
1996	36803.86072499005
1997	36322.130074996116
1998	35955.25817560773
1999	35753.031466019536
2000	34903.50381004466
2001	32941.494259121086
2002	31127.720343891277
2003	29901.472778353276
2004	28915.685295416195
2005	28152.489366276906
2006	27539.79758937267
2007	26939.8230019954
2008	26268.868435656048
2009	25559.75054961451
2010	24857.46573786746
2011	24197.01817120449
2012	23568.969507203783
2013	22972.467927922156
2014	22406.804498390073
2015	21873.542760657096
2016	21350.66153023127
2017	20839.940788518234
2018	20352.917037312367
2019	19883.61128136453
2020	19431.695767655216