Year	cubic meters
1961	12205.558967033365
1962	11969.445186322395
1963	11672.716097788447
1964	11382.71589360353
1965	11106.457510865046
1966	10842.316661359964
1967	10581.79915834332
1968	10325.340701833176
1969	10074.218393231291
1970	9832.19487171218
1971	9604.363178050799
1972	9380.447788276697
1973	9154.144345067993
1974	8934.089225603093
1975	8721.424991769436
1976	8516.040135017223
1977	8314.35429383236
1978	8115.934326337166
1979	7919.917847048882
1980	7723.284267705121
1981	7527.652693039542
1982	7339.002191971716
1983	7158.568485021694
1984	6985.301321782982
1985	6818.193063287215
1986	6656.215367610945
1987	6500.508636980912
1988	6350.841139349123
1989	6206.720864245061
1990	6059.780541371837
1991	5924.597786794539
1992	5752.360159323362
1993	5552.748801000424
1994	5437.297478309302
1995	5330.489536119052
1996	5222.873628859153
1997	5119.424596998598
1998	5021.3914784095705
1999	4927.693327350129
2000	4836.484220409338
2001	4747.877475221098
2002	4664.752790120031
2003	4585.938469426047
2004	4508.103976339099
2005	4434.565238166876
2006	4363.448551062089
2007	4294.634658584745
2008	4228.80616945575
2009	4165.041866521671
2010	4101.483586805576
2011	4039.617725216485
2012	3981.375803113448
2013	3925.437577369552
2014	3871.047651944622
2015	3817.770746534957
2016	3766.4151575460523
2017	3717.30535015411
2018	3669.7265646266164
2019	3623.8708424108986
2020	3581.1044740516777