Year	cubic meters
1961	16324.493580299179
1962	15868.294349505775
1963	15429.856308094095
1964	15007.853901330787
1965	14601.193249749478
1966	14211.647148002794
1967	13837.189205247605
1968	13475.885886873511
1969	13131.5011553802
1970	12795.311925930584
1971	12466.898302851723
1972	12153.511074500035
1973	11854.606395636873
1974	11573.312318710949
1975	11298.653292520741
1976	11017.985999567101
1977	10728.720210610825
1978	10437.835834371723
1979	10158.155051703525
1980	9892.699117831466
1981	9641.836957140928
1982	9403.492311771432
1983	9172.786086319747
1984	8950.76832629172
1985	8738.857045069515
1986	8536.82735637198
1987	8342.742140906128
1988	8152.369591743116
1989	7966.425524573738
1990	7781.165933152344
1991	7598.380266444898
1992	7421.3486170766155
1993	7248.425060235699
1994	7080.532094743788
1995	6916.920763625742
1996	6751.712020622632
1997	6587.014035991802
1998	6430.227773165942
1999	6282.044327783486
2000	6144.316552725939
2001	6015.616540539239
2002	5892.804691095734
2003	5775.061684952976
2004	5661.436566954034
2005	5552.898897245287
2006	5449.260530226701
2007	5348.287577132718
2008	5249.181264705515
2009	5153.477277592463
2010	5061.461356957713
2011	4972.0819673558835
2012	4886.143821327818
2013	4804.408083533953
2014	4727.353069844885
2015	4649.0697274562945
2016	4567.330489536017
2017	4487.60283789258
2018	4411.947457924298
2019	4339.5226583056965
2020	4269.50555925723