Year	cubic meters
1961	6873.484514946215
1962	6665.128886770548
1963	6463.668743774239
1964	6269.367009703734
1965	6079.840040919766
1966	5890.694392351784
1967	5691.445311522293
1968	5487.9789127295935
1969	5294.009873379026
1970	5110.01181262769
1971	4934.525544897107
1972	4766.496360875723
1973	4605.3691736136125
1974	4449.666445175941
1975	4300.350277097141
1976	4162.428629868569
1977	4040.37282675453
1978	3928.7476910156374
1979	3820.5384256313573
1980	3715.354144999688
1981	3613.123583334312
1982	3513.842726311964
1983	3417.5612988301223
1984	3324.292697933663
1985	3234.990848625315
1986	3150.995334960444
1987	3078.3918669240043
1988	3016.612131164372
1989	2959.6664801077027
1990	2907.1754983471346
1991	2858.690501112594
1992	2814.0867911716236
1993	2773.8324180923887
1994	2737.2998185950064
1995	2704.1294590345074
1996	2675.0577208917407
1997	2651.351352721488
1998	2633.9128109389476
1999	2622.549007317564
2000	2616.7925028644627
2001	2615.689234113189
2002	2618.2282754636467
2003	2624.145145833229
2004	2634.2511070906185
2005	2644.8551246470156
2006	2645.7167717196653
2007	2636.799741865876
2008	2621.5354879715132
2009	2603.0662428098385
2010	2585.592760735772
2011	2566.64819792342
2012	2545.361455927286
2013	2521.771373217824
2014	2496.1317117545373
2015	2468.7034020432184
2016	2439.511314108305
2017	2409.453164699254
2018	2379.4174476357553
2019	2349.8204162102566
2020	2320.2164943880043