Year	cubic meters
1961	7662.421051818756
1962	7449.060552200592
1963	7242.168282727513
1964	7040.3337445652305
1965	6841.91516343426
1966	6646.069004743439
1967	6453.43806913133
1968	6265.696115195551
1969	6083.673142634546
1970	5906.939600855729
1971	5735.097194337103
1972	5568.202713657119
1973	5406.493953632818
1974	5253.062199310545
1975	5111.0139974429085
1976	4979.546224374879
1977	4860.315841408271
1978	4748.560937564706
1979	4636.556842569486
1980	4523.245537371213
1981	4408.72729783123
1982	4293.994133538557
1983	4180.253841863913
1984	4068.2449670054298
1985	3956.6273892163504
1986	3844.500390037976
1987	3733.807324253814
1988	3626.8372461003064
1989	3523.7082741040767
1990	3423.5664246859837
1991	3327.1909262087083
1992	3235.306878889422
1993	3147.6654021917266
1994	3065.226232111049
1995	2988.642809806131
1996	2917.422360097442
1997	2850.3440133219333
1998	2785.7180339395477
1999	2721.9312967660503
2000	2658.618814550724
2001	2596.088740753069
2002	2534.1446525127812
2003	2472.5660175126677
2004	2411.509968836375
2005	2350.9992703701105
2006	2290.607612079741
2007	2231.087190627981
2008	2173.010551987635
2009	2115.6161252261068
2010	2059.0383764051444
2011	2003.7465400423116
2012	1949.8432303370216
2013	1897.677522215699
2014	1846.7738864454527
2015	1797.135324498904
2016	1748.9917537072527
2017	1702.0947574623826
2018	1656.5104810564223
2019	1612.421293685602
2020	1569.713533364322