Year	cubic meters
1961	14499.413879625374
1962	14206.042284433577
1963	13911.606787809993
1964	13620.982777672833
1965	13330.402328288335
1966	13043.518405210749
1967	12761.673145686269
1968	12482.065586472278
1969	12205.019998953507
1970	11923.901966742418
1971	11631.831091432221
1972	11319.794347664403
1973	10993.385555020195
1974	10665.423536941551
1975	10336.229401224187
1976	10010.769312151358
1977	9678.12748014078
1978	9337.939181061802
1979	9013.426140769048
1980	8787.771977380993
1981	8616.82738381351
1982	8427.277593599705
1983	8246.098436217457
1984	8071.6401113999
1985	7910.05408883945
1986	7769.293351398167
1987	7736.336399663303
1988	7741.125644566409
1989	7663.740437134253
1990	7539.392574517649
1991	7396.11427475864
1992	7259.236002683962
1993	7060.270779334228
1994	6725.732861803356
1995	6431.618683884339
1996	6237.735588794041
1997	6070.795033254399
1998	5926.776829079852
1999	5785.016668403709
2000	5644.819302468047
2001	5504.72330505563
2002	5365.086371471733
2003	5227.564808513206
2004	5092.815418546917
2005	4962.616113095003
2006	4837.002655577151
2007	4713.232242098675
2008	4591.319677567595
2009	4470.362344484429
2010	4346.936122965505
2011	4221.305674676387
2012	4095.9487636421536
2013	3972.004929087831
2014	3851.958223420029
2015	3736.507872408575
2016	3621.397120566853
2017	3510.744224922006
2018	3408.7960805166467
2019	3311.805496969764
2020	3216.987335301394