Year	cubic meters
1961	4037.2904528663976
1962	3971.7703530094063
1963	3904.351722198173
1964	3835.2424524848834
1965	3764.835920774694
1966	3693.5540668181866
1967	3621.9920323208285
1968	3550.2330400542123
1969	3478.35953810087
1970	3406.712149030096
1971	3335.0807429523757
1972	3263.2029826308894
1973	3191.443214000211
1974	3120.0057190007747
1975	3048.5070750521727
1976	2976.5955780505265
1977	2904.309487730561
1978	2832.061242911942
1979	2759.6229122648897
1980	2686.532049675282
1981	2613.172571633276
1982	2540.459280507401
1983	2469.120413009532
1984	2399.2154798314496
1985	2330.552961024104
1986	2263.048893720633
1987	2196.7301990898713
1988	2131.788400753039
1989	2068.4060019920958
1990	2006.4600220632685
1991	1945.9494589693725
1992	1887.2149068723572
1993	1805.060161954204
1994	1738.8679530687982
1995	1703.4617153594859
1996	1660.2566789063585
1997	1612.6441320263923
1998	1564.355061212606
1999	1517.2519650254274
2000	1471.8442623009387
2001	1428.167144363156
2002	1385.9392826728122
2003	1344.7865627882152
2004	1304.6968834464874
2005	1263.8937818757388
2006	1225.8065360718565
2007	1191.0597436723795
2008	1156.4627912588032
2009	1122.920063136453
2010	1090.442116050567
2011	1058.9756929093867
2012	1028.5520044880818
2013	999.1531449557802
2014	970.3392720608989
2015	942.12059271642
2016	914.7355459572465
2017	888.1776569166318
2018	862.5972232911636
2019	838.0494634693425
2020	814.6721344085636