Year	cubic meters
1961	22206.80290039311
1962	20317.083021358183
1963	19853.515818623764
1964	19390.01041364857
1965	18928.22427453034
1966	18466.92837824858
1967	18001.584092680005
1968	17540.1637953174
1969	17093.129808040638
1970	16657.681112796858
1971	16238.318879140697
1972	15843.245352717366
1973	15456.980107124711
1974	15070.973950030728
1975	14694.395189580395
1976	14332.884138946396
1977	13978.641925171196
1978	13597.273314008444
1979	13211.125065020564
1980	12908.785485018705
1981	12714.290816059787
1982	12485.114626785697
1983	12175.420762359181
1984	11848.645818125875
1985	11530.886695314703
1986	11238.234617214464
1987	10956.756337282299
1988	10684.948629728005
1989	10410.893914528579
1990	10164.324280632156
1991	9934.906514846529
1992	9646.069916860117
1993	7960.852790705207
1994	7731.995411144396
1995	7514.016622302966
1996	7294.9769521124745
1997	7092.031183652581
1998	6899.237625081355
1999	6709.794623435959
2000	6535.72521263741
2001	6364.82948939049
2002	6177.021267775371
2003	5990.820332565939
2004	5820.571673442166
2005	5655.487987533642
2006	5489.097073772361
2007	5329.9312546408455
2008	5180.924586149766
2009	5036.360123605004
2010	4896.173761894791
2011	4759.721743650751
2012	4293.834674796563
2013	4186.587750081677
2014	4084.327324968226
2015	3982.8056067207567
2016	3879.447908264906
2017	3776.6819225256136
2018	3675.396422566722
2019	3574.046264816592
2020	3476.0051616236515