Year	cubic meters
1961	6850.1800108173275
1962	6737.593015400967
1963	6621.765339607312
1964	6487.454954497554
1965	6317.30678379869
1966	6109.034039537668
1967	5875.84893243489
1968	5640.6697191682215
1969	5423.28503937305
1970	5233.498211281329
1971	5072.311311121903
1972	4934.131489884601
1973	4809.886114444339
1974	4693.235822856875
1975	4582.197247254965
1976	4475.2810768382415
1977	4371.583037649594
1978	4269.696294646172
1979	4164.795526647448
1980	4051.9923470196713
1981	3930.461589991336
1982	3803.7364599385514
1983	3678.0756308299497
1984	3557.8997130167154
1985	3446.717346399289
1986	3343.635607683965
1987	3244.0724449332806
1988	3147.7355464195193
1989	3055.5388017558453
1990	2967.016834853521
1991	2882.050215339274
1992	2800.629971270407
1993	2819.7387597857196
1994	2809.9414261601146
1995	2687.1883737743497
1996	2586.6627619305323
1997	2504.0554811597044
1998	2432.1653229481985
1999	2362.3951070894245
2000	2296.3098301030245
2001	2234.9947312428553
2002	2177.396053952466
2003	2121.379427895328
2004	2066.406023986841
2005	2013.4473773272168
2006	1957.7000599226453
2007	1901.600602030215
2008	1848.1371259892755
2009	1797.2614112034087
2010	1749.8864475859557
2011	1704.0389575904712
2012	1660.2578308226143
2013	1618.2985378039464
2014	1577.8534141249163
2015	1538.8261218811842
2016	1501.040155565191
2017	1464.4467352070185
2018	1429.1610240696814
2019	1395.1072255150798
2020	1362.1428520665486