Year	cubic meters
1961	2643.798065193039
1962	2620.758956818129
1963	2599.606716641011
1964	2578.47781404018
1965	2559.6745459137355
1966	2542.9710645010077
1967	2527.0070874125445
1968	2509.0795823887943
1969	2489.870967772533
1970	2473.6223513688674
1971	2460.054859223361
1972	2448.6369254448355
1973	2435.92163152927
1974	2419.7046923259063
1975	2408.051975393837
1976	2397.6437327476688
1977	2385.229839043555
1978	2382.5645289238796
1979	2379.3499615904934
1980	2369.792592366898
1981	2361.907958246416
1982	2354.931456355775
1983	2349.062131351053
1984	2343.572401153975
1985	2343.6069248897415
1986	2344.2285261131988
1987	2340.7824834565195
1988	2338.15356680873
1989	2365.6715375468125
1990	2408.7295110313503
1991	2432.7047262934952
1992	2458.969172020584
1993	2478.6619663367014
1994	2487.0934653277263
1995	2498.195648452481
1996	2511.112870218751
1997	2526.4470887389275
1998	2543.362514179246
1999	2557.661878074066
2000	2570.325324852402
2001	2622.0037052658076
2002	2679.541737116285
2003	2700.851038162125
2004	2721.314109624899
2005	2741.8823309446752
2006	2762.7863726746223
2007	2783.17551844596
2008	2802.77998404017
2009	2820.8960697261027
2010	2839.526588718507
2011	2857.792956438526
2012	2874.393913511951
2013	2890.5254768850873
2014	2907.0016935361296
2015	2925.609686610084
2016	2946.2015185003215
2017	2967.8006350245414
2018	2989.308099017842
2019	3010.42423901851
2020	3028.5483951217293