Year	cubic meters
1961	4352.524261817009
1962	4248.313111731424
1963	4145.234213437956
1964	4044.746828670389
1965	3947.081715107272
1966	3851.326392991827
1967	3757.191390025798
1968	3665.3245311041624
1969	3576.4451863241525
1970	3489.623343374829
1971	3403.282670670198
1972	3316.9077213254973
1973	3230.4299293928893
1974	3143.6257145467093
1975	3056.259604068575
1976	2967.8795989721652
1977	2876.1276416181017
1978	2778.5381171014374
1979	2676.9987096003742
1980	2575.2432958710424
1981	2475.5015076172285
1982	2379.005672911483
1983	2286.664087203791
1984	2199.209102273034
1985	2116.6996586789014
1986	2040.5018117355153
1987	1945.5175528716093
1988	1843.5641051443777
1989	1759.1481973363184
1990	1691.8833103678169
1991	1641.647978596328
1992	1595.5837721023943
1993	1573.5237758565102
1994	1593.0043618117572
1995	1595.994627015858
1996	1565.3902496554979
1997	1535.2891052118214
1998	1503.8496314357126
1999	1470.7549401510269
2000	1437.3001838835905
2001	1403.622528854705
2002	1369.5958877501614
2003	1335.212337229633
2004	1300.4234352739616
2005	1265.3218401762106
2006	1230.3416896707786
2007	1195.957485860248
2008	1162.035312770012
2009	1128.7556301407685
2010	1096.5849464025423
2011	1065.6212750297204
2012	1035.8603426643986
2013	1007.1904285707601
2014	979.4898229550904
2015	952.8340081688692
2016	927.2864908491646
2017	902.625650775478
2018	878.7076877612951
2019	855.446637752853
2020	832.9436543550129