Year	cubic meters
1961	4262.185454581772
1962	4161.40653892934
1963	4062.6190377546022
1964	3965.8668442537337
1965	3870.855980395839
1966	3778.215978786128
1967	3687.887395531157
1968	3599.3648012057756
1969	3511.067103676713
1970	3419.133266643308
1971	3326.425054765252
1972	3235.122281216047
1973	3144.067720105753
1974	3054.7498890762854
1975	2967.7229279025505
1976	2883.241288472002
1977	2798.9479650632175
1978	2714.2681822375785
1979	2631.196173910778
1980	2553.6765103732364
1981	2480.9710340490756
1982	2407.6327201577496
1983	2333.6178601401975
1984	2270.940942269608
1985	2219.5455821043975
1986	2168.6723187659154
1987	2117.2835322159017
1988	2065.2035892011527
1989	2012.9617463526029
1990	1961.5482169915133
1991	1912.4597129000329
1992	1865.5857187997105
1993	1820.5159895078195
1994	1778.0799013946132
1995	1737.497501272158
1996	1698.0488130190467
1997	1658.6344238352883
1998	1619.0474358456463
1999	1580.034949538742
2000	1540.7692109766635
2001	1500.3285125252921
2002	1459.6552727806663
2003	1420.5668258545413
2004	1383.1546553151209
2005	1346.8491796955063
2006	1311.7686078273364
2007	1278.0323531992146
2008	1245.5764052804711
2009	1214.391768876638
2010	1184.7637504834365
2011	1156.226368669608
2012	1128.12347791756
2013	1100.7935631695836
2014	1074.6068694403725
2015	1049.4982515116671
2016	1025.2314189240058
2017	1002.5722098498121
2018	981.515090664946
2019	961.2245810821486
2020	941.5668872491676