Year	cubic meters
1961	8318.307620075533
1962	8187.067730789521
1963	7990.947504692063
1964	7799.691730069029
1965	7615.470175838902
1966	7439.046357190858
1967	7267.653679520437
1968	7098.688617025522
1969	6932.671373681663
1970	6771.994367842253
1971	6620.571373352077
1972	6470.8975335825635
1973	6318.441637689527
1974	6169.478800881653
1975	6025.420671879018
1976	5884.648854799987
1977	5745.150342076594
1978	5609.787240871969
1979	5476.2884940552485
1980	5339.461905483688
1981	5203.226513072282
1982	5072.375118002505
1983	4947.073743225326
1984	4826.51588440912
1985	4709.1485386510285
1986	4595.161665235843
1987	4485.44622955773
1988	4379.7695561386945
1989	4277.746530251976
1990	4174.322245264311
1991	4079.6372837647223
1992	3991.601296277785
1993	3904.9265036174083
1994	3813.04306000821
1995	3732.427907801064
1996	3655.2940900168974
1997	3580.9316723627344
1998	3508.9321125251486
1999	3439.5911095205174
2000	3371.7091632539623
2001	3305.6205562693567
2002	3242.8587271094034
2003	3183.0871207127716
2004	3124.0288166948335
2005	3068.9664744397155
2006	3016.4520171426598
2007	2965.7377834416225
2008	2917.0072317027943
2009	2869.39789722155
2010	2821.6989894426597
2011	2774.870767809762
2012	2730.1351125035044
2013	2686.369221958986
2014	2643.7829458594288
2015	2603.4666867567853
2016	2564.468044512988
2017	2526.529853783814
2018	2490.045390342352
2019	2455.1196758225483
2020	2421.1331688891296