Year	cubic meters
1961	3272.255589652558
1962	3211.9983089286984
1963	3155.30801065435
1964	3099.5991992086456
1965	3043.037207078132
1966	2988.089224109908
1967	2934.31837275386
1968	2881.4760104439383
1969	2829.674357933465
1970	2778.791372095269
1971	2728.8807560722157
1972	2680.1332009922694
1973	2632.6175792548033
1974	2585.5495470567234
1975	2538.1691306180433
1976	2490.6450018018736
1977	2443.16729300182
1978	2395.9841338582746
1979	2349.35083536789
1980	2303.479073352181
1981	2258.0824926647474
1982	2212.9464598641234
1983	2168.650553150112
1984	2125.350412390203
1985	2082.6064812020227
1986	2040.2826811890077
1987	1998.5099139582096
1988	1957.4236650670077
1989	1917.2599235189143
1990	1878.1773752041597
1991	1840.7725385664278
1992	1805.078700709708
1993	1770.6379306120116
1994	1737.488897743829
1995	1705.318096169085
1996	1673.874825254649
1997	1643.2997286729837
1998	1613.592335144877
1999	1584.4918364013092
2000	1555.8193708901376
2001	1528.1268386395807
2002	1501.6949630008314
2003	1476.0143414078932
2004	1451.4329036167983
2005	1427.4739626203095
2006	1403.6904529623944
2007	1380.6644979962477
2008	1358.3983786527908
2009	1336.7057740715459
2010	1321.462823888943
2011	1306.6699135008025
2012	1286.7339187196092
2013	1267.5897940261602
2014	1249.1428768988758
2015	1231.2854224117423
2016	1214.0361507801724
2017	1197.3073609594953
2018	1181.12084527099
2019	1165.456051097636
2020	1150.3695872952924