Year	cubic meters
1962	3266.6928002090685
1963	3224.1943544356855
1964	3182.534252024888
1965	3137.550200803213
1966	3089.8529230008653
1967	3041.3625304136253
1968	2991.1014731174755
1969	2940.8737335862484
1970	2902.9682850714858
1971	2880.5991646262423
1972	2862.4588521540004
1973	2843.574942417608
1974	2823.9812487645086
1975	2805.0490883590464
1976	2787.5341472933046
1977	2772.310166061379
1978	2759.458042440465
1979	2748.4608619173264
1980	2740.5519471621583
1981	2742.2804804475404
1982	2753.834714840415
1983	2767.4383207184273
1984	2780.2491103202847
1985	2793.452148164702
1986	2808.3971073509792
1987	2824.539600045193
1988	2841.0301575351223
1989	2858.16362986781
1990	2878.4847656193783
1991	2892.639678338468
1992	2893.853455261026
1993	2891.468721537105
1994	2890.2569438423075
1995	2890.131645496452
1996	2891.5941358470927
1997	2895.1520678623647
1998	2901.157561867185
1999	2911.2929051791903
2000	2926.2868346355312
2001	2934.573679808666
2002	2929.8877852978235
2003	2922.182285730984
2004	2916.5572957680756
2005	2912.3103357893815
2006	2909.4294608827213
2007	2908.0334423845875
2008	2907.737489459452
2009	2907.526131391106
2010	2908.8793542287835
2011	2909.4294608827213
2012	2903.2632679131348
2013	2906.1741670178294
2014	2883.049112741636
2015	2856.857171425715
2016	2854.084909026044
2017	2840.7880346007983
2018	2823.9413749770556
2019	2800.0224001792017
2020	2777.970692409195