Year	cubic meters
1961	4975.479814861121
1962	4833.415707956596
1963	4692.568763879926
1964	4553.54531448944
1965	4417.23328065877
1966	4283.481697396621
1967	4151.837156004322
1968	4022.1237432152448
1969	3897.4565198751297
1970	3780.090978066555
1971	3673.5831131224345
1972	3582.7269567958956
1973	3498.9820205257465
1974	3412.4687759107005
1975	3324.536382745861
1976	3237.797012874892
1977	3152.979407891487
1978	3070.3828586350855
1979	2997.3459654301487
1980	2935.8569457783356
1981	2875.3517329302535
1982	2809.787744311044
1983	2740.8943974150698
1984	2667.953851786544
1985	2593.2721875215066
1986	2518.2724883186056
1987	2441.434371489656
1988	2365.166841598045
1989	2290.2722799008698
1990	2217.5937061278937
1991	2146.16660251096
1992	2074.2511713934596
1993	2003.8064101047746
1994	1937.8861766156667
1995	1885.8042986763926
1996	1835.331083374291
1997	1782.6994503571912
1998	1730.4371199527475
1999	1675.3119205273265
2000	1623.5998480810113
2001	1574.909669844417
2002	1526.7121783481678
2003	1479.8099286595016
2004	1436.6713077289526
2005	1395.5191954023153
2006	1355.4266957960608
2007	1316.2422539143356
2008	1278.27520163808
2009	1241.5431808718308
2010	1205.872487703811
2011	1171.321086200282
2012	1137.912184982506
2013	1105.6436873273672
2014	1073.2997988608656
2015	1040.6283730367745
2016	1006.4957948218579
2017	971.9121137256793
2018	939.410548785577
2019	908.0520467493134
2020	878.2871670692037