Year	cubic meters
1961	5822.852199374459
1962	5542.140057796603
1963	5277.482490067024
1964	5043.772742011023
1965	4832.61879612562
1966	4625.8665239256425
1967	4424.862671226382
1968	4230.732037520549
1969	4052.215693652493
1970	3907.7982906173756
1971	3795.3750643858266
1972	3700.160164075673
1973	3616.3936289476806
1974	3539.518726582291
1975	3467.3892045313823
1976	3396.475428926325
1977	3324.8786419295693
1978	3255.5716783867247
1979	3190.1415511379687
1980	3128.4636561907823
1981	3070.768042955658
1982	3014.9411871115567
1983	2958.754955914551
1984	2902.5650381894625
1985	2846.2805212759467
1986	2791.0240666018085
1987	2738.461297717688
1988	2687.6353416368465
1989	2636.6043549170786
1990	2586.089057518315
1991	2535.6990197712075
1992	2482.507190404755
1993	2429.1722768978775
1994	2380.976676632755
1995	2336.80738698198
1996	2295.5862435354647
1997	2256.8196253034616
1998	2219.4180051870967
1999	2185.6422041264923
2000	2153.7533767776154
2001	2123.6188892866458
2002	2095.795833557883
2003	2068.007917516027
2004	2040.2869226352345
2005	2012.6278018654182
2006	1984.892135290248
2007	1957.1331913013817
2008	1929.4642980195426
2009	1901.8793284735789
2010	1875.308086328468
2011	1852.096838206112
2012	1832.1681616286403
2013	1815.1173343705432
2014	1798.880068665822
2015	1782.5448119033247
2016	1767.7839060953188
2017	1754.298030173926
2018	1741.700795708449
2019	1730.2876974072874
2020	1722.1400788740154