Year	cubic meters
1961	4858.052562185501
1962	4764.563842296749
1963	4672.466339552489
1964	4582.36479961777
1965	4495.947353055955
1966	4413.498951352649
1967	4333.17618347708
1968	4253.1835078556305
1969	4172.285344263609
1970	4090.097764243493
1971	4007.979620225227
1972	3922.184897548608
1973	3833.468995541676
1974	3749.4760107275006
1975	3672.770811755805
1976	3603.1266491810934
1977	3538.9452669084317
1978	3477.4714331517553
1979	3406.8129900416584
1980	3402.7262642829432
1981	3401.9583940488405
1982	3244.767056009871
1983	3086.9450418826414
1984	3048.435989754003
1985	3019.5728713521044
1986	2930.7407349516234
1987	2829.733786191352
1988	2735.709655851373
1989	2645.21386465922
1990	2574.19296047464
1991	2482.4457982784406
1992	2379.847074200141
1993	2326.201715806386
1994	2275.1409904871807
1995	2177.429750309776
1996	2083.2491353474466
1997	2013.1866409229308
1998	1945.7486365166428
1999	1879.2543970481174
2000	1816.1703819660577
2001	1756.6862993927487
2002	1697.145706408049
2003	1631.0790588369364
2004	1560.30533303001
2005	1499.2485766134014
2006	1447.0922803029323
2007	1398.8973518033793
2008	1351.5140200658386
2009	1304.787142244763
2010	1261.0629903485803
2011	1217.7568431845802
2012	1176.0180749274045
2013	1134.9221133218216
2014	1095.1202463932943
2015	1060.7998119414092
2016	1027.9193165570048
2017	994.3069958644783
2018	961.2790394387155
2019	930.1249232181876
2020	901.1877113322732