Year	cubic meters
1961	8193.80668506742
1962	7949.4588483167045
1963	7711.377474383224
1964	7480.282337594394
1965	7256.239198946873
1966	7041.517131263778
1967	6836.617092894769
1968	6640.862224160262
1969	6453.739542640832
1970	6272.67842446724
1971	6099.489738602184
1972	5934.020228795056
1973	5775.465065009032
1974	5626.681522783374
1975	5488.105385312494
1976	5360.520363244198
1977	5240.197870394415
1978	5125.013368384276
1979	5015.852179567732
1980	4908.636416834906
1981	4804.686734253721
1982	4706.675046760673
1983	4612.849676185185
1984	4523.062400330852
1985	4437.400261765307
1986	4355.857175690223
1987	4278.077434173372
1988	4203.44399319503
1989	4132.795513379316
1990	4065.1179347730636
1991	4001.9704147238144
1992	3942.990237626148
1993	3885.8640501098707
1994	3830.574333633453
1995	3778.0500993911064
1996	3728.7147206222585
1997	3681.149099606441
1998	3636.071114625769
1999	3595.4591357756412
2000	3559.887314685397
2001	3527.2644296081444
2002	3495.810974893877
2003	3465.893025291278
2004	3437.543895633405
2005	3410.898832840889
2006	3385.2775634324885
2007	3359.5826007051005
2008	3334.559218161045
2009	3310.6902040701125
2010	3288.5365739800104
2011	3267.365755742383
2012	3246.380342311727
2013	3226.7104188152557
2014	3209.0762412965187
2015	3193.8534162260466
2016	3179.7113933558776
2017	3166.652942764331
2018	3156.431011322408
2019	3148.4650556209426
2020	3141.0691057028866